978-1285770178 Case Problem Case CPC-23-08 Part 1

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Owner-Operator Independent Drivers Ass'n, Inc. v. Federal Motor Owner-
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Carrier Safety Administration (FMCSA) in 2000. Along the way, Congress added
to the statutory basis for the HOS regulations. The current rule was promulgated
under the authority of both the Motor Carrier Act of 1935 and the Motor Carrier
condition of operators ... is adequate to enable them to operate the vehicles
safely ...; and (4) the operation of commercial motor vehicles does not have a
deleterious effect on the physical condition of the operators.
Id. In addition, FMCSA is required to “consider the assignment and maintenance
of safety as the highest priority,” id. § 113(b), and to consider the “costs and
“within a 150 air-mile radius from their terminals.” Hours of Service of Drivers, 70
Fed.Reg. 49,978, 50,031 (Aug. 25, 2005).
• The daily driving limit. Drivers were not allowed to drive for more than a total of
10 hours without taking a required off-duty period. 49 C.F.R. § 395.3(a)(1) (2002)
(superseded).
the 15-hour on-duty limit, drivers were required to take at least 8 consecutive
hours off duty. 49 C.F.R. § 395.3(a) (2002) (superseded).
• The sleeper-berth exception. The regulations contained an exception to the 8-
hour off-duty requirement for drivers who took their off-duty time in a “sleeper
berth,” a compartment in the cabin of a truck with space for a driver to rest.
subject to a slightly different limit, which barred them from driving after having
been on duty for 70 hours in the past 8 days. See 49 C.F.R. § 395.3(b) (2002)
(superseded). All of the rules and proposed rules discussed in this Opinion
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contain(ed) the same set of 7- and 8-day limits. For simplicity, we hereinafter
refer only to the 7-day limit.
issues pertaining to commercial motor vehicle ... safety.” 49 U.S.C. § 31136 note.
Congress specifically instructed the agency to address the following issues:
8 hours of continuous sleep after 10 hours of driving, loading and unloading
operations, automated and tamper-proof recording devices, rest and recovery
cycles, fatigue and stress in longer combination vehicles, fitness for duty, and
NPRM explained that “[t]here is general consensus that modifications to current
HOS regulations would substantially improve [commercial motor vehicle (CMV) ]
safety by reducing the fatigue factor in CMV-involved crashes.” Id. at 25,540.
In the 2000 NPRM, the agency made a number of specific findings that identified
shortcomings in the pre-2003 HOS regulations. First, FMCSA found that “people
driver should have an opportunity for eight consecutive hours of uninterrupted
sleep every day.” 2000 NPRM, 65 Fed.Reg. at 25,554. In the agency's view, the
old regulations' 8-hour off-duty period was too short to allow drivers to eat,
commute, and conduct other personal activities while still getting enough sleep.
See id. Third, FMCSA concluded that drivers need weekly recovery periods “to
extend the 15-hour window by taking off-duty breaks.
Based on these findings, the 2000 NPRM proposed significant changes to the
existing HOS regulations. Instead of a 10-hour daily driving limit and a 15-hour
daily on-duty limit, the 2000 NPRM proposed allowing up to 12 hours of working
or driving time, and requiring an additional 2 hours of off-duty time at some point
page-pf4
drivers-who work in two-person teams and often use the sleeper berth to allow
one driver to obtain the required off-duty time while the other continues to drive-
could still use the sleeper-berth exception, but each period of time in the sleeper
berth would have to be at least 5 hours (up from 2 hours under the old
regulations). See id. at 25,586-87.
• The daily driving limit. The 2003 Rule increased (over the pre-2003 regulations)
the daily driving limit from 10 hours to 11 hours. See 2003 Rule, 68 Fed.Reg. at
22,457.
• The daily on-duty limit. The 2003 Rule reduced the daily on-duty limit from 15 to
14 hours and prohibited drivers from extending that limit by taking off-duty breaks
sleeper berth could satisfy the off-duty requirement in two separate periods as
long as each of them was at least 2 hours long. See id. at 22,501.
• The weekly on-duty limit. The 2003 Rule preserved the 60-hour weekly on-duty
limit, but created a new exception to this requirement, the “34-hour restart
provision.” See id. at 22,457.
substantially longer hours per week-as many as 17 more hours over 7 days. See
Public Citizen, 374 F.3d at 1215.
A group of petitioners led by Public Citizen challenged the 2003 Rule on a variety
of grounds. We agreed with them that “the rule [was] arbitrary and capricious
because the agency failed to consider the impact of the rule[ ] on the health of
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Citizen's other objections to the 2003 Rule. Id. We noted, however, that several
of those objections “also raise[d] troubling concerns about [FMCSA's]
decisionmaking process,” and that the agency could consider the objections on
remand. Id. First, we expressed “very real concerns” about the increase in the
daily driving limit from 10 to 11 hours. Id. at 1217. We noted that the “agency
from the increase” in driving time. Id.
Second, we also found suspect the agency's claim that the increase in the daily
driving limit to 11 hours could be justified by “the cost-benefit analysis it
conducted.” Id. The model employed in that analysis, we noted, “assume[d],
dubiously, that time spent driving is equally fatiguing as time spent resting-that is,
necessary ten hours of off-duty time by splitting their rest in two periods of time
spent in sleeper berths.” Id. at 1219. Public Citizen “argue[d] persuasively,” we
said, “that the agency's justification for retaining this exception was not rational in
view of the conceded central premise of the HOS regulations ... that ‘[e]ach driver
should have an opportunity for eight consecutive hours of uninterrupted sleep
[2003] rule's rationality questionable.” Id. at 1222-23 (citation and internal
quotation marks omitted).
B
After our July 16, 2004 decision in Public Citizen vacated the 2003 Rule, FMCSA
sought and received temporary relief from the vacatur in Congress. The Surface
page-pf6
2005) (“2005 NPRM”). The 2005 NPRM used the 2003 Rule as its proposal and
sought “comment on what changes to that rule, if any, [were] necessary to
respond to the concerns raised by the court” in Public Citizen. Id. at 3339.
In August 2005, FMCSA promulgated the rule now under review. See Hours of
Service of Drivers, 70 Fed.Reg. 49,978 (Aug. 25, 2005) (“2005 Rule”). With a
two periods as long as each period was at least 2 hours long. The 2005 Rule, by
contrast, requires that one period consist of at least 8 hours in the sleeper berth.
The other period can be spent either in the sleeper berth or elsewhere and must
be at least two hours long. See id. at 50,030.
FMCSA also determined that the 2005 Rule would improve highway safety by
reducing fatigue-related accidents. First, it explained that the 2005 Rule's change
to the sleeper-berth exception would reduce driver fatigue. It cited evidence that
“sleep accumulated in short time blocks is less refreshing than sleep
accumulated in one long time period,” and studies indicating that drivers using
Finally, FMCSA relied on a new cost-benefit analysis that it described in a
Regulatory Impact Analysis (RIA) released along with the 2005 Rule. See
FMCSA, Regulatory Impact Analysis and Small Business Impact Analysis for
Hours of Service Options (2005) (J.A. 1627) (“2005 RIA”). Based on this
analysis, FMCSA concluded that the economic costs to industry of rescinding the
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regimes.
Public Citizen petitioned for review of the 2005 Rule, challenging the 11-hour
daily driving limit and the 34-hour restart provision. The Owner-Operator
Independent Drivers Association (OOIDA) also petitioned for review, challenging
the provision that renders the 14-hour daily on-duty limit nonextendable and the
Administrative Procedure Act (APA), 5 U.S.C. § 706. See Advocates for Highway
& Auto Safety v. FMCSA, 429 F.3d 1136, 1144-45 (D.C.Cir.2005); Public Citizen,
374 F.3d at 1216. Under the APA, we must set the rule aside if it is “arbitrary,
capricious, an abuse of discretion, or otherwise not in accordance with law,” 5
U.S.C. § 706(2)(A), or if it was promulgated “without observance of procedure
was disclosed, FMCSA failed to provide a reasoned explanation for some of its
critical elements, thus rendering it (and the rule) arbitrary and capricious; (3)
FMCSA's treatment of a number of other safety considerations was also arbitrary
and capricious; and (4) the rule is contrary to law and arbitrary and capricious
because it fails to protect driver health. As explained below, we reach only the
[2] Link to KeyCite Notes 1. The APA requires that an agency publish notice of
proposed rulemaking, including “either the terms or substance of the proposed
rule or a description of the subjects and issues involved,” 5 U.S.C. § 553(b)(3),
and that it “give interested persons an opportunity to participate in the rule
making through submission of written data, views, or arguments,” id. § 553(c). As
NRC, 673 F.2d 525, 530-31 (D.C.Cir.1982)); see Chamber of Commerce v. SEC,
page-pf8
443 F.3d 890, 899 (D.C.Cir.2006); see also Air Transp. Ass'n of Am. v. FAA, 169
F.3d 1, 7 (D.C.Cir.1999) (“ ‘[T]he most critical factual material that is used to
support the agency's position on review must have been made public in the
proceeding and exposed to refutation.’ ” (quoting Association of Data Processing
monetized and incorporated into the cost-benefit analysis.) The agency explained
the models in the RIA that it released along with the 2005 Rule. See 2005 RIA
(J.A. 1627); see also 2005 Rule, 70 Fed.Reg. at 50,045-55. FMCSA summarized
its analysis as follows:
To produce a realistic measurement of the impacts of each option, we divided the
Safety impacts were measured by feeding the on duty and driving schedules
from the carrier simulation model into an operator fatigue model to project driver
effectiveness levels, and then using the fatigue model results to estimate the
resulting changes in crash risks under each HOS option.... Changes in fatigue-
related crash risks ... were then multiplied by the value of all affected crashes to
fatigue model. In part, those modifications represented an effort to respond to
criticisms this court leveled in our opinion vacating the 2003 Rule. One of those
criticisms was that the agency had “excluded time-on-task effects from the cost-
benefit analysis.” Public Citizen, 374 F.3d at 1219. The agency's 2003 operator-
fatigue model had estimated a driver's crash risk solely by reference to his or her
22,471).
In its 2005 analysis, FMCSA modified its 2003 operator-fatigue model to account
for time-on-task effects. To do so, the agency commissioned a study of crash
page-pf9
data from a national database known as “Trucks Involved in Fatal Accidents”
(TIFA). See Kenneth L. Campbell, Estimates of the Prevalence and Risk of
determined that the driver was fatigued at the time of the crash. This calculation
yielded the risk that a crash will be fatigue-related for each of the first twelve
hours of driving time, plus an aggregated figure for all driving in Hour 13 and
beyond. The figures ranged from less than 1% for Hour 1, to 4.4% for Hour 10, to
9.6% for Hour 11, to 25% for Hour 13 and beyond. Id. at 45 (J.A. 1665). As
curve” (derived a regression equation) for that and the other hour-by-hour figures
from the TIFA Study. 2005 RIA at 58-59 (J.A. 1678-79). (The curve is reproduced
in Part II.B.1 below.) Like the TIFA Study, the curve estimated the actual
percentage of crashes related to fatigue for each hour of driving. The curve's
figures, however, were different from those in the TIFA Study. See id. In
Id.
FMCSA used the operator-fatigue model, along with the carrier-operations
model, to determine the benefits and costs of four regulatory options. Option 1
was the 2003 Rule. Option 2 was the 2005 Rule. Option 3 was the same as
Option 2, but with a 10-hour rather than 11-hour daily driving limit, with a 58-hour
Option 2, which differed only in that it imposed a 10-hour (as in the pre-2003
regulations) rather than 11-hour daily driving limit. Applying the same models, the
agency concluded that reducing the driving limit to 10 hours was “considerably
less cost-effective than the basic version of Option 2.” 2005 RIA at ES-7 (J.A.
1634); see 2005 Rule, 70 Fed.Reg. at 50,046-47.
page-pfa
(and particularly the 11-hour daily driving limit and 34-hour restart provision), the
model and its methodology were unquestionably among “the most critical factual
material that [was] used to support the agency's position.” Air Transp. Ass'n of
Am., 169 F.3d at 7 (citation and internal quotation mark omitted). The failure to
provide an opportunity for comment on the model's methodology therefore
is an update of the [one] used in the 2003 RIA.” FMCSA Br. 44. It is true that an
agency does not violate the APA if its “methodology remain[s] constant” and new
data is merely “used to check or confirm prior assessments.” Solite Corp., 952
F.2d at 485; see Chamber of Commerce, 443 F.3d at 900 (stating that “further
notice and comment are not required when additional fact gathering merely
modification used to check or confirm prior analyses: it constituted the agency's
response to an important defect in its previous methodology identified by this
court in Public Citizen. See 374 F.3d at 1218-19.
Although FMCSA concedes that the time-on-task multipliers were nowhere to be
found in the 2003 RIA, it contends that our opinion in Public Citizen should have
of the agency's methodology, the import of which we discuss in Part II.B:
• Instead of using the figures from the TIFA Study to determine crash risk as a
function of time on task (hours driving), FMCSA fit the figures to a cubic curve.
None of the studies in the rulemaking record derived such a curve. An earlier
version of the TIFA Study, which was in the record, simply presented its risk
figures for each hour-derived directly from the crash data-in bar-chart form. See
Kenneth L. Campbell & Michael H. Belzer, Hours of Service Regulatory
Carrier Safety Administration (FMCSA) in 2000. Along the way, Congress added
to the statutory basis for the HOS regulations. The current rule was promulgated
under the authority of both the Motor Carrier Act of 1935 and the Motor Carrier
condition of operators ... is adequate to enable them to operate the vehicles
safely ...; and (4) the operation of commercial motor vehicles does not have a
deleterious effect on the physical condition of the operators.
Id. In addition, FMCSA is required to “consider the assignment and maintenance
of safety as the highest priority,” id. § 113(b), and to consider the “costs and
“within a 150 air-mile radius from their terminals.” Hours of Service of Drivers, 70
Fed.Reg. 49,978, 50,031 (Aug. 25, 2005).
• The daily driving limit. Drivers were not allowed to drive for more than a total of
10 hours without taking a required off-duty period. 49 C.F.R. § 395.3(a)(1) (2002)
(superseded).
the 15-hour on-duty limit, drivers were required to take at least 8 consecutive
hours off duty. 49 C.F.R. § 395.3(a) (2002) (superseded).
• The sleeper-berth exception. The regulations contained an exception to the 8-
hour off-duty requirement for drivers who took their off-duty time in a “sleeper
berth,” a compartment in the cabin of a truck with space for a driver to rest.
subject to a slightly different limit, which barred them from driving after having
been on duty for 70 hours in the past 8 days. See 49 C.F.R. § 395.3(b) (2002)
(superseded). All of the rules and proposed rules discussed in this Opinion
contain(ed) the same set of 7- and 8-day limits. For simplicity, we hereinafter
refer only to the 7-day limit.
issues pertaining to commercial motor vehicle ... safety.” 49 U.S.C. § 31136 note.
Congress specifically instructed the agency to address the following issues:
8 hours of continuous sleep after 10 hours of driving, loading and unloading
operations, automated and tamper-proof recording devices, rest and recovery
cycles, fatigue and stress in longer combination vehicles, fitness for duty, and
NPRM explained that “[t]here is general consensus that modifications to current
HOS regulations would substantially improve [commercial motor vehicle (CMV) ]
safety by reducing the fatigue factor in CMV-involved crashes.” Id. at 25,540.
In the 2000 NPRM, the agency made a number of specific findings that identified
shortcomings in the pre-2003 HOS regulations. First, FMCSA found that “people
driver should have an opportunity for eight consecutive hours of uninterrupted
sleep every day.” 2000 NPRM, 65 Fed.Reg. at 25,554. In the agency's view, the
old regulations' 8-hour off-duty period was too short to allow drivers to eat,
commute, and conduct other personal activities while still getting enough sleep.
See id. Third, FMCSA concluded that drivers need weekly recovery periods “to
extend the 15-hour window by taking off-duty breaks.
Based on these findings, the 2000 NPRM proposed significant changes to the
existing HOS regulations. Instead of a 10-hour daily driving limit and a 15-hour
daily on-duty limit, the 2000 NPRM proposed allowing up to 12 hours of working
or driving time, and requiring an additional 2 hours of off-duty time at some point
drivers-who work in two-person teams and often use the sleeper berth to allow
one driver to obtain the required off-duty time while the other continues to drive-
could still use the sleeper-berth exception, but each period of time in the sleeper
berth would have to be at least 5 hours (up from 2 hours under the old
regulations). See id. at 25,586-87.
• The daily driving limit. The 2003 Rule increased (over the pre-2003 regulations)
the daily driving limit from 10 hours to 11 hours. See 2003 Rule, 68 Fed.Reg. at
22,457.
• The daily on-duty limit. The 2003 Rule reduced the daily on-duty limit from 15 to
14 hours and prohibited drivers from extending that limit by taking off-duty breaks
sleeper berth could satisfy the off-duty requirement in two separate periods as
long as each of them was at least 2 hours long. See id. at 22,501.
• The weekly on-duty limit. The 2003 Rule preserved the 60-hour weekly on-duty
limit, but created a new exception to this requirement, the “34-hour restart
provision.” See id. at 22,457.
substantially longer hours per week-as many as 17 more hours over 7 days. See
Public Citizen, 374 F.3d at 1215.
A group of petitioners led by Public Citizen challenged the 2003 Rule on a variety
of grounds. We agreed with them that “the rule [was] arbitrary and capricious
because the agency failed to consider the impact of the rule[ ] on the health of
Citizen's other objections to the 2003 Rule. Id. We noted, however, that several
of those objections “also raise[d] troubling concerns about [FMCSA's]
decisionmaking process,” and that the agency could consider the objections on
remand. Id. First, we expressed “very real concerns” about the increase in the
daily driving limit from 10 to 11 hours. Id. at 1217. We noted that the “agency
from the increase” in driving time. Id.
Second, we also found suspect the agency's claim that the increase in the daily
driving limit to 11 hours could be justified by “the cost-benefit analysis it
conducted.” Id. The model employed in that analysis, we noted, “assume[d],
dubiously, that time spent driving is equally fatiguing as time spent resting-that is,
necessary ten hours of off-duty time by splitting their rest in two periods of time
spent in sleeper berths.” Id. at 1219. Public Citizen “argue[d] persuasively,” we
said, “that the agency's justification for retaining this exception was not rational in
view of the conceded central premise of the HOS regulations ... that ‘[e]ach driver
should have an opportunity for eight consecutive hours of uninterrupted sleep
[2003] rule's rationality questionable.” Id. at 1222-23 (citation and internal
quotation marks omitted).
B
After our July 16, 2004 decision in Public Citizen vacated the 2003 Rule, FMCSA
sought and received temporary relief from the vacatur in Congress. The Surface
2005) (“2005 NPRM”). The 2005 NPRM used the 2003 Rule as its proposal and
sought “comment on what changes to that rule, if any, [were] necessary to
respond to the concerns raised by the court” in Public Citizen. Id. at 3339.
In August 2005, FMCSA promulgated the rule now under review. See Hours of
Service of Drivers, 70 Fed.Reg. 49,978 (Aug. 25, 2005) (“2005 Rule”). With a
two periods as long as each period was at least 2 hours long. The 2005 Rule, by
contrast, requires that one period consist of at least 8 hours in the sleeper berth.
The other period can be spent either in the sleeper berth or elsewhere and must
be at least two hours long. See id. at 50,030.
FMCSA also determined that the 2005 Rule would improve highway safety by
reducing fatigue-related accidents. First, it explained that the 2005 Rule's change
to the sleeper-berth exception would reduce driver fatigue. It cited evidence that
“sleep accumulated in short time blocks is less refreshing than sleep
accumulated in one long time period,” and studies indicating that drivers using
Finally, FMCSA relied on a new cost-benefit analysis that it described in a
Regulatory Impact Analysis (RIA) released along with the 2005 Rule. See
FMCSA, Regulatory Impact Analysis and Small Business Impact Analysis for
Hours of Service Options (2005) (J.A. 1627) (“2005 RIA”). Based on this
analysis, FMCSA concluded that the economic costs to industry of rescinding the
regimes.
Public Citizen petitioned for review of the 2005 Rule, challenging the 11-hour
daily driving limit and the 34-hour restart provision. The Owner-Operator
Independent Drivers Association (OOIDA) also petitioned for review, challenging
the provision that renders the 14-hour daily on-duty limit nonextendable and the
Administrative Procedure Act (APA), 5 U.S.C. § 706. See Advocates for Highway
& Auto Safety v. FMCSA, 429 F.3d 1136, 1144-45 (D.C.Cir.2005); Public Citizen,
374 F.3d at 1216. Under the APA, we must set the rule aside if it is “arbitrary,
capricious, an abuse of discretion, or otherwise not in accordance with law,” 5
U.S.C. § 706(2)(A), or if it was promulgated “without observance of procedure
was disclosed, FMCSA failed to provide a reasoned explanation for some of its
critical elements, thus rendering it (and the rule) arbitrary and capricious; (3)
FMCSA's treatment of a number of other safety considerations was also arbitrary
and capricious; and (4) the rule is contrary to law and arbitrary and capricious
because it fails to protect driver health. As explained below, we reach only the
[2] Link to KeyCite Notes 1. The APA requires that an agency publish notice of
proposed rulemaking, including “either the terms or substance of the proposed
rule or a description of the subjects and issues involved,” 5 U.S.C. § 553(b)(3),
and that it “give interested persons an opportunity to participate in the rule
making through submission of written data, views, or arguments,” id. § 553(c). As
NRC, 673 F.2d 525, 530-31 (D.C.Cir.1982)); see Chamber of Commerce v. SEC,
443 F.3d 890, 899 (D.C.Cir.2006); see also Air Transp. Ass'n of Am. v. FAA, 169
F.3d 1, 7 (D.C.Cir.1999) (“ ‘[T]he most critical factual material that is used to
support the agency's position on review must have been made public in the
proceeding and exposed to refutation.’ ” (quoting Association of Data Processing
monetized and incorporated into the cost-benefit analysis.) The agency explained
the models in the RIA that it released along with the 2005 Rule. See 2005 RIA
(J.A. 1627); see also 2005 Rule, 70 Fed.Reg. at 50,045-55. FMCSA summarized
its analysis as follows:
To produce a realistic measurement of the impacts of each option, we divided the
Safety impacts were measured by feeding the on duty and driving schedules
from the carrier simulation model into an operator fatigue model to project driver
effectiveness levels, and then using the fatigue model results to estimate the
resulting changes in crash risks under each HOS option.... Changes in fatigue-
related crash risks ... were then multiplied by the value of all affected crashes to
fatigue model. In part, those modifications represented an effort to respond to
criticisms this court leveled in our opinion vacating the 2003 Rule. One of those
criticisms was that the agency had “excluded time-on-task effects from the cost-
benefit analysis.” Public Citizen, 374 F.3d at 1219. The agency's 2003 operator-
fatigue model had estimated a driver's crash risk solely by reference to his or her
22,471).
In its 2005 analysis, FMCSA modified its 2003 operator-fatigue model to account
for time-on-task effects. To do so, the agency commissioned a study of crash
data from a national database known as “Trucks Involved in Fatal Accidents”
(TIFA). See Kenneth L. Campbell, Estimates of the Prevalence and Risk of
determined that the driver was fatigued at the time of the crash. This calculation
yielded the risk that a crash will be fatigue-related for each of the first twelve
hours of driving time, plus an aggregated figure for all driving in Hour 13 and
beyond. The figures ranged from less than 1% for Hour 1, to 4.4% for Hour 10, to
9.6% for Hour 11, to 25% for Hour 13 and beyond. Id. at 45 (J.A. 1665). As
curve” (derived a regression equation) for that and the other hour-by-hour figures
from the TIFA Study. 2005 RIA at 58-59 (J.A. 1678-79). (The curve is reproduced
in Part II.B.1 below.) Like the TIFA Study, the curve estimated the actual
percentage of crashes related to fatigue for each hour of driving. The curve's
figures, however, were different from those in the TIFA Study. See id. In
Id.
FMCSA used the operator-fatigue model, along with the carrier-operations
model, to determine the benefits and costs of four regulatory options. Option 1
was the 2003 Rule. Option 2 was the 2005 Rule. Option 3 was the same as
Option 2, but with a 10-hour rather than 11-hour daily driving limit, with a 58-hour
Option 2, which differed only in that it imposed a 10-hour (as in the pre-2003
regulations) rather than 11-hour daily driving limit. Applying the same models, the
agency concluded that reducing the driving limit to 10 hours was “considerably
less cost-effective than the basic version of Option 2.” 2005 RIA at ES-7 (J.A.
1634); see 2005 Rule, 70 Fed.Reg. at 50,046-47.
(and particularly the 11-hour daily driving limit and 34-hour restart provision), the
model and its methodology were unquestionably among “the most critical factual
material that [was] used to support the agency's position.” Air Transp. Ass'n of
Am., 169 F.3d at 7 (citation and internal quotation mark omitted). The failure to
provide an opportunity for comment on the model's methodology therefore
is an update of the [one] used in the 2003 RIA.” FMCSA Br. 44. It is true that an
agency does not violate the APA if its “methodology remain[s] constant” and new
data is merely “used to check or confirm prior assessments.” Solite Corp., 952
F.2d at 485; see Chamber of Commerce, 443 F.3d at 900 (stating that “further
notice and comment are not required when additional fact gathering merely
modification used to check or confirm prior analyses: it constituted the agency's
response to an important defect in its previous methodology identified by this
court in Public Citizen. See 374 F.3d at 1218-19.
Although FMCSA concedes that the time-on-task multipliers were nowhere to be
found in the 2003 RIA, it contends that our opinion in Public Citizen should have
of the agency's methodology, the import of which we discuss in Part II.B:
• Instead of using the figures from the TIFA Study to determine crash risk as a
function of time on task (hours driving), FMCSA fit the figures to a cubic curve.
None of the studies in the rulemaking record derived such a curve. An earlier
version of the TIFA Study, which was in the record, simply presented its risk
figures for each hour-derived directly from the crash data-in bar-chart form. See
Kenneth L. Campbell & Michael H. Belzer, Hours of Service Regulatory

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