As applied to interstate motor carriers operating under
certificates of public convenience and necessity issued by the
Interstate Commerce Commission, the Illinois statute here involved
which requires trucks and trailers operating on that State's
highways to be equipped with a specified type of rear fender
mudguard which would be illegal in Arkansas, which is different
from those permitted in at least 45 other States, and which would
seriously interfere with the "interline" operations of motor
carriers, is invalid because it unduly and unreasonably burdens
interstate commerce in violation of Art. I, § 8 of the
Constitution. Pp.
359 U. S.
521-530.
(a) Even state safety regulations must yield when they run afoul
of the policy of free trade reflected in the Commerce Clause. Pp.
359 U. S.
523-524,
359 U. S.
528-529.
(b) Interchanging mudguards on trucks and trailers at the border
of Illinois is a time-consuming task, and the necessity to use
welding might mean that some trucks or trailers would have to be
unloaded and loaded again -- all of which adds up to a serious
burden on interstate commerce not justified by a compelling need
for this new safety measure. Pp.
359 U. S.
527-528.
(c) The record in this case shows that this is one of those
exceptional cases where a state safety regulation in the exercise
of the police power places such a heavy burden on interstate
commerce, uncompensated by compelling advantages of safety, that it
violates the Commerce Clause. Pp.
359 U. S.
529-530.
159 F.
Supp. 385, affirmed.
Page 359 U. S. 521
MR. JUSTICE DOUGLAS delivered the opinion of the Court.
We are asked in this case to hold that an Illinois statute
[
Footnote 1] requiring the use
of a certain type of rear fender
Page 359 U. S. 522
mudguard on trucks and trailers operated on the highways of that
State conflicts with the Commerce Clause of the Constitution. The
statutory specification for this type of mudguard provides that the
guard shall contour the rear wheel, with the inside surface being
relatively parallel to the top 90 degrees of the rear 180 degrees
of the whole surface. [
Footnote
2] The surface of the guard must extend downward to within 10
inches from the ground when the truck is loaded to its maximum
legal capacity. The guards must be wide enough to cover the width
of the protected tire, must be installed not more than 6 inches
from the tire surface when the vehicle is loaded
Page 359 U. S. 523
to maximum capacity, and must have a lip or flange on its outer
edge of not less than 2 inches. [
Footnote 3]
Appellees, interstate motor carriers holding certificates from
the Interstate Commerce Commission, challenged the
constitutionality of the Illinois Act. A specially constituted
three-judge District Court concluded that it unduly and
unreasonably burdened and obstructed interstate commerce because it
made the conventional or straight mudflap, which is legal in at
least 45 States, illegal in Illinois, and because the statute,
taken together with a Rule of the Arkansas Commerce Commission
[
Footnote 4] requiring straight
mudflaps, rendered the use of the same motor vehicle equipment in
both States impossible. The statute was declared to be violative of
the Commerce Clause, and appellants were enjoined from enforcing
it.
159 F.
Supp. 385. An appeal was taken, and we noted probable
jurisdiction. 358 U.S. 808.
The power of the State to regulate the use of its highways is
broad and pervasive. We have recognized the peculiarly local nature
of this subject of safety, and have upheld state statutes
applicable alike to interstate and intrastate commerce, despite the
fact that they may have an impact on interstate commerce.
South
Carolina Highway Dept. v. Barnwell Bros., 303 U.
S. 177;
Maurer v. Hamilton, 309 U.
S. 598;
Sproles v. Binford, 286 U.
S. 374. The regulation of highways
"is akin to quarantine
Page 359 U. S. 524
measures, game laws, and like local regulations of rivers,
harbors, piers, and docks, with respect to which the state has
exceptional scope for the exercise of its regulatory power, and
which, Congress not acting, have been sustained even though they
materially interfere with interstate commerce."
Southern Pacific Co. v. Arizona, 325 U.
S. 761,
325 U. S.
783.
These safety measures carry a strong presumption of validity
when challenged in court. If there are alternative ways of solving
a problem, we do not sit to determine which of them is best suited
to achieve a valid state objective. Policy decisions are for the
state legislature, absent federal entry into the field. [
Footnote 5] Unless we can conclude on
the whole record that
"the total effect of the law as a safety measure in reducing
accidents and casualties is so slight or problematical as not to
outweigh the national interest in keeping interstate commerce free
from interferences which seriously impede it"
(
Southern Pacific Co. v. Arizona, supra, pp.
325 U. S.
775-776) we must uphold the statute.
The District Court found that,
"since it is impossible for a carrier operating in interstate
commerce to determine which of its equipment will be used in a
particular area, or on a particular day, or days, carriers
operating into or through Illinois . . . will be required to equip
all their trailers in accordance with the requirements of the
Illinois Splash Guard statute."
With two possible exceptions,
Page 359 U. S. 525
the mudflaps required in those States which have mudguard
regulations would not meet the standards required by the Illinois
statute. The cost of installing the contour mudguards is $30 or
more per vehicle. The District Court found that the initial cost of
installing those mudguards on all the trucks owned by the appellees
ranged from $4,500 to $45,840. There was also evidence in the
record to indicate that the cost of maintenance and replacement of
these guards is substantial.
Illinois introduced evidence seeking to establish that contour
mudguards had a decided safety factor in that they prevented the
throwing of debris into the faces of drivers of passing cars and
into the windshields of a following vehicle. But the District
Court, in its opinion, stated that it was
"conclusively shown that the contour mud flap possesses no
advantages over the conventional or straight mud flap previously
required in Illinois and presently required in most of the
states"
(159 F.Supp. at 388), and that "there is rather convincing
testimony that use of the contour flap creates hazards previously
unknown to those using the highways."
Id. at 390. These
hazards were found to be occasioned by the fact that this new type
of mudguard tended to cause an accumulation of heat in the brake
drum, thus decreasing the effectiveness of brakes, and by the fact
that they were susceptible of being hit and bumped when the trucks
were backed up, and of falling off on the highway.
These findings on cost and on safety are not the end of our
problem. Local regulation of the weight of trucks using the
highways upheld in
Sproles v. Binford, supra, also
involved increased financial burdens for interstate carriers. State
control of the width and weight of motor trucks and trailers
sustained in
South Carolina Highway Dept. v. Barnwell Bros.,
supra, involved nice questions of judgment concerning the need
of those regulations so far as the issue of safety was concerned.
That case also presented
Page 359 U. S. 526
the problem whether interstate motor carriers, who were required
to replace all equipment or keep out of the State, suffered an
unconstitutional restraint on interstate commerce. The matter of
safety was said to be one essentially for the legislative judgment,
and the burden of redesigning or replacing equipment was said to be
a proper price to exact from interstate and intrastate motor
carriers alike. And the same conclusion was reached in
Maurer
v. Hamilton, supra, where a state law prohibited any motor
carrier from carrying any other vehicle above the cab of the
carrier vehicle or over the head of the operator of that vehicle.
Cost taken into consideration with other factors might be relevant
in some cases to the issue of burden on commerce. But it has
assumed no such proportions here. If we had here only a question
whether the cost of adjusting an interstate operation to these new
local safety regulations prescribed by Illinois unduly burdened
interstate commerce, we would have to sustain the law under the
authority of the
Sproles, Barnwell, and
Maurer
cases. The same result would obtain if we had to resolve the much
discussed issues of safety presented in this case.
This case presents a different issue. The equipment in the
Sproles, Barnwell, and
Maurer cases could pass
muster in any State, so far as the records in those cases reveal.
We were not faced there with the question whether one State could
prescribe standards for interstate carriers that would conflict
with the standards of another State, making it necessary, say, for
an interstate carrier to shift its cargo to differently designed
vehicles once another state line was reached. We had a related
problem in
Southern Pacific Co. v. Arizona, supra, where
the Court invalidated a statute of Arizona prescribing a maximum
length of 70 cars for freight trains moving through that State.
More closely in point is
Morgan v. Virginia, 328 U.
S. 373, where a local law required a reseating of
passengers on interstate
Page 359 U. S. 527
busses entering Virginia in order to comply with a local
segregation law. Diverse seating arrangements for people of
different races imposed by several States interfered, we concluded,
with "the need for national uniformity in the regulations for
interstate travel."
Id. at
328 U. S. 386.
Those cases indicate the dimensions of our present problem.
An order of the Arkansas Commerce Commission, already mentioned,
[
Footnote 6] requires that
trailers operating in that State be equipped with straight or
conventional mudflaps. Vehicles equipped to meet the standards of
the Illinois statute would not comply with Arkansas standards, and
vice versa. Thus, if a trailer is to be operated in both States,
mudguards would have to be interchanged, causing a significant
delay in an operation where prompt movement may be of the essence.
It was found that from two to four hours of labor are required to
install or remove a contour mudguard. Moreover, the contour guard
is attached to the trailer by welding, and if the trailer is
conveying a cargo of explosives (
e.g., for the United
States Government), it would be exceedingly dangerous to attempt to
weld on a contour mudguard without unloading the trailer.
It was also found that the Illinois statute seriously interferes
with the "interline" operations of motor carriers -- that is to
say, with the interchanging of trailers between an originating
carrier and another carrier when the latter serves an area not
served by the former. These "interline" operations provide a speedy
through service for the shipper. Interlining contemplates the
physical transfer of the entire trailer; there is no unloading and
reloading of the cargo. The interlining process is particularly
vital in connection with shipment of perishables, which would spoil
if unloaded before reaching their destination, or with the movement
of explosives carried
Page 359 U. S. 528
under seal. Of course, if the originating carrier never operated
in Illinois, it would not be expected to equip its trailers with
contour mudguards. Yet if an interchanged trailer of that carrier
were hauled to or through Illinois, the statute would require that
it contain contour guards. Since carriers which operate in and
through Illinois cannot compel the originating carriers to equip
their trailers with contour guards, they may be forced to cease
interlining with those who do not meet the Illinois requirements.
Over 60 percent of the business of 5 of the 6 plaintiffs is
interline traffic. For the other, it constitutes 30 percent. All of
the plaintiffs operate extensively in interstate commerce, and the
annual mileage in Illinois of none of them exceeds 7 percent of
total mileage.
This, in summary, is the rather massive showing of burden on
interstate commerce which appellees made at the hearing.
Appellants did not attempt to rebut the appellees' showing that
the statute in question severely burdens interstate commerce.
Appellants' showing was aimed at establishing that contour
mudguards prevented the throwing of debris into the faces of
drivers of passing cars and into the windshields of a following
vehicle. They concluded that, because the Illinois statute is a
reasonable exercise of the police power, a federal court is
precluded from weighing the relative merits of the contour mudguard
against any other kind of mudguard, and must sustain the validity
of the statute notwithstanding the extent of the burden it imposes
on interstate commerce. They rely in the main on
South Carolina
Highway Dept. v. Barnwell Bros., supra. There is language in
that opinion which, read in isolation from such later decisions as
Southern Pacific Co. v. Arizona, supra, and
Morgan v.
Virginia, supra, would suggest that no showing of burden on
interstate commerce is sufficient to invalidate local
Page 359 U. S. 529
safety regulations in absence of some element of discrimination
against interstate commerce.
The various exercises by the States of their police power stand,
however, on an equal footing. All are entitled to the same
presumption of validity when challenged under the Due Process
Clause of the Fourteenth Amendment.
Lincoln Union v.
Northwestern Co., 335 U. S. 525;
Day-Brite Lighting, Inc. v. Missouri, 342 U.
S. 421;
Williamson v. Lee Optical Co.,
348 U. S. 483.
Similarly, the various state regulatory statutes are of equal
dignity when measured against the Commerce Clause. Local
regulations which would pass muster under the Due Process Clause
might nonetheless fail to survive other challenges to
constitutionality that bring the Supremacy Clause into play. Like
any local law that conflicts with federal regulatory measures
(
California Comm'n v. United States, 355 U.
S. 534;
Service Storage & Transfer Co. v.
Virginia, 359 U. S. 171),
state regulations that run afoul of the policy of free trade
reflected in the Commerce Clause must also bow.
This is one of those cases -- few in number -- where local
safety measures that are nondiscriminatory place an
unconstitutional burden on interstate commerce. This conclusion is
especially underlined by the deleterious effect which the Illinois
law will have on the "interline" operation of interstate motor
carriers. The conflict between the Arkansas regulation and the
Illinois regulation also suggests that this regulation of mudguards
is not one of those matters "admitting of diversity of treatment,
according to the special requirements of local conditions," to use
the words of Chief Justice Hughes in
Sproles v. Binford,
supra, at
286 U. S. 390.
A State which insists on a design out of line with the requirements
of almost all the other States may sometimes place a great burden
of delay and inconvenience on those interstate motor carriers
Page 359 U. S. 530
entering or crossing its territory. Such a new safety device --
out of line with the requirements of the other States -- may be so
compelling that the innovating State need not be the one to give
way. But the present showing -- balanced against the clear burden
on commerce -- is far too inconclusive to make this mudguard meet
that test. We deal not with absolutes, but with questions of
degree. The state legislatures plainly have great leeway in
providing safety regulations for all vehicles -- interstate as well
as local. Our decisions so hold. Yet the heavy burden which the
Illinois mudguard law places on the interstate movement of trucks
and trailers seems to us to pass the permissible limits even for
safety regulations.
Affirmed.
[
Footnote 1]
The state statute (effective July 8, 1957) in relevant part
provides:
"It is unlawful for any person to operate any motor vehicle of
the second division upon the highways of this state outside the
corporate limits of a city, village or incorporated town unless
such vehicle is equipped with rear fender splash guards which shall
comply with the specifications hereinafter provided in this
Section; except that any motor vehicle of the second division which
is or has been purchased, new or used, prior to August 1, 1957,
shall be equipped with rear fender splash guards which are so
attached as to prevent the splashing of mud or water upon the
windshield of other motor vehicles and such splash guards on such
vehicle shall not be required to comply with the specifications
hereinafter provided in this Section until January 1, 1958."
"The rear fender splash guards shall contour the wheel in such a
manner that the relationship of the inside surface of any such
splash guard to the tread surface of the tire or wheel shall be
relatively parallel, both laterally and across the wheel, at least
throughout the top 90 degrees of the rear 180 degrees of the wheel
surface; provided however, on vehicles which have a clearance of
less than 5 inches between the top of the tire or wheel and that
part of the body of the vehicle directly above the tire or wheel
when the vehicle is loaded to maximum legal capacity, the curved
portion of the splash guard need only extend from a point directly
behind the center of the rear axle and to the rear of the wheel
surface upwards to within at least 2 inches of the bottom line of
the body when the vehicle is loaded to maximum legal capacity. On
all vehicles to which this Section applies, there shall be a
downward extension of the curved surface which shall end not more
than 10 inches from the ground when the vehicle is loaded to
maximum legal capacity. This downward extension shall be part of
the curved surface or attached directly to said curved surface, but
it need not contour the wheel."
"The splash guards shall be wide enough to cover the full tread
or treads of the tires being protected, and shall be installed not
more than 6 inches from the tread surface of the tire or wheel when
the vehicle is loaded to maximum legal capacity. The splash guard
shall have a lip or flange on its outside edge to minimize side
throw and splash. The lip or flange shall extend toward the center
of the wheel, and shall be perpendicular to and extend not less
than 2 inches below the inside or bottom surface line or plane of
the guard."
"The splash guards may be constructed of a rigid or flexible
material, but shall be attached in such a manner that, regardless
of movement, either by the splash guards or the vehicle, the splash
guards will retain their general parallel relationship to the tread
surface of the tire or wheel under all ordinary operating
conditions."
Ill.Rev.Stat., 1957, c. 95 1/2, § 218b.
Motor vehicles of the second division are defined as
"Those vehicles which are designed and used for pulling or
carrying freight and also those vehicles or motor cars which are
designed and used for the carrying of more than seven persons."
Ill.Rev.Stat., 1957, c. 95 1/2, § 99(b).
[
Footnote 2]
The specifications are somewhat modified if the clearance
between the top of the tire and the body of the vehicle directly
above it is less than 5 inches when the vehicle is loaded to its
maximum legal capacity.
[
Footnote 3]
There are certain exemptions from the statute, but their
validity or the validity of the statute in light of them is not
questioned here.
But see Rudolph Express Co. v.
Bibb, 15 Ill. 2d
76,
153 N.E.2d
820. No contention is here made that the statute discriminates
against interstate commerce, and it is clear that its provisions
apply alike to vehicles in intrastate, as well as in interstate,
commerce. Nor is it contended that the statute violates the Due
Process Clause of the Fourteenth Amendment.
Cf. People v.
Warren, 11 Ill. 2d
420,
143 N.E.2d
28.
[
Footnote 4]
Arkansas Commerce Commission Rule 100, December 13, 1957.
[
Footnote 5]
It is not argued that there has been a preemption of the field
by federal regulation. While the Interstate Commerce Commission
has, pursuant to § 204(a) of the Interstate Commerce Act (49
Stat. 546, 49 U.S.C. § 304(a)), promulgated its Motor Carrier
Safety Regulations to govern vehicles operating in interstate or
foreign commerce (
see 49 CFR, Pts.190-197), it has
expressly declined to establish any requirements concerning wheel
flaps, and has disclaimed any intention to occupy the field or
abrogate state regulations not inconsistent with its standards. 54
M.C.C. 337, 354, 358.
[
Footnote 6]
Note 4 supra.
MR. JUSTICE HARLAN, whom MR. JUSTICE STEWART joins,
concurring.
The opinion of the Court clearly demonstrates the heavy burden,
in terms of cost and interference with "interlining," which the
Illinois statute here involved imposes on interstate commerce. In
view of the findings of the District Court, summarized on page
359 U. S. 525
of the Court's opinion and fully justified by the record, to the
effect that the contour mudflap "possesses no advantages" in terms
of safety over the conventional flap permitted in all other States,
and indeed creates certain safety hazards, this heavy burden cannot
be justified on the theory that the Illinois statute is a
necessary, appropriate, or helpful local safety measure.
Accordingly, I concur in the judgment of the Court.