American Trucking Assns., Inc. v. Los Angeles
The Court ruled that federal trucking law preempts two requirements in the Port of Los Angeles's contract with drayage trucking companies — a rule requiring parking plans and one requiring safety placards — because the Port enforced them using criminal penalties, not just ordinary contract terms.
The decision draws a line between governments acting as regulators, who are limited by federal preemption law, and governments acting as market participants striking ordinary business deals, who are not. Because the Port backed its rules with criminal punishment for terminal operators, it crossed into regulation.
“That counts as action "having the force and effect of law" if anything does.”
The Court's core reasoning for why the Port's criminally-backed rules counted as regulation, not contract.
How it got here: A federal trial court and the Ninth Circuit largely upheld the Port's program; the trucking association asked the Supreme Court to review the preemption and enforcement questions.
The Case in Depth
What happened
The Port of Los Angeles required drayage trucking companies to sign a "concession agreement" with placard, parking, financial, maintenance, and employment requirements as part of a Clean Truck Program addressing community concerns about a port expansion. The Port made compliance mandatory by amending its tariff to criminally punish terminal operators who let unregistered trucks in. A trucking trade association sued, arguing federal law preempted several of these requirements and that a prior case limited how the Port could penalize violators.
The question before the Court
Could the Port of Los Angeles require trucking companies to sign a contract with parking and placard rules, backed by criminal penalties, without running into federal trucking deregulation law?
The Court's answer
No — the Port could not use criminal penalties to force trucking companies into contract terms requiring parking plans and safety placards. The federal trucking deregulation law preempts state and local rules that have "the force and effect of law" over a motor carrier's price, route, or service, and the Court found that because the Port backed these requirements with a criminal misdemeanor charge against terminal operators, it was acting as a regulator, not simply as a business partner striking an ordinary deal.
The Court left open, however, whether an older precedent limits how the Port can enforce its separate, still-valid financial-capacity and truck-maintenance requirements by suspending or revoking a company's access, since the case hadn't yet reached the enforcement stage.
Curious how the Court got there? See the step-by-step legal reasoning →
Why it matters
Ports, cities, and other government-run facilities that want to impose conditions on trucking companies must now be careful about using criminal or other coercive legal mechanisms to enforce those conditions, or risk having them struck down under federal law. The ruling also leaves unresolved how the Port can enforce its remaining, valid requirements against noncompliant truckers.
What changes now
The case is sent back to the lower courts for further proceedings. The Port can no longer enforce the placard and parking requirements as written, but its financial-capacity and truck-maintenance requirements remain valid and in effect. The dispute over whether a 1954 precedent limits the Port's power to suspend or revoke a trucking company's access for violating those remaining requirements was left unresolved and may return to the courts once the Port actually tries to enforce penalties.
What this does not decide
The Court did not decide whether a 1954 precedent (Castle v. Hayes Freight Lines) limits the Port's ability to suspend or revoke a trucking company's right to operate for violating the still-valid financial-capacity and truck-maintenance requirements, because the case's pre-enforcement posture left it unclear how the Port would actually apply its penalty provision.
Concurrences and dissents
Concurrence — Justice Thomas
Justice Thomas joined the Court's opinion in full but wrote separately to question whether Congress even has constitutional authority under the Commerce Clause to regulate matters like truck parking and placards once trucks leave the port, since these seem more like local, intrastate activities. He argued the 'substantial effects' test used to justify broad congressional power is unmoored from the Constitution's structure, though he did not press this concern because the parties had waived the constitutional argument.
How the Court got there
The legal reasoning, step by step
- The Court looked at the federal trucking deregulation law's preemption clause, which blocks state or local rules 'having the force and effect of law' related to a motor carrier's price, route, or service — as opposed to a government simply acting as an ordinary business partner in a contract.
- Drawing on a prior case construing similar language, the Court explained that a government acting like any private party in a voluntary contract is not exercising 'regulatory' power, but a government using coercive tools available only to government — like criminal punishment — is.
- Applying that distinction, the Court found the Port's placard and parking requirements were backed by a criminal misdemeanor charge against terminal operators for admitting noncompliant trucks, which is a classic exercise of governmental, not proprietary, power.
- The Court rejected the Port's argument that its business-minded motives (building goodwill to support port expansion) mattered, holding that the government's motive doesn't change the legal character of the coercive tool it used.
- The Court also rejected the argument that because the criminal penalty fell on terminal operators rather than truckers directly, the rule escaped preemption, noting the Court has repeatedly rejected such indirect-targeting workarounds in other preemption cases.
- Turning to whether a 1954 precedent limits the Port's ability to suspend or revoke a trucking company's access for violating its still-valid financial and maintenance rules, the Court found the record too undeveloped in this pre-enforcement lawsuit to decide how the Port's penalty clause would actually be applied, and declined to rule on that question.
Doctrinal impact
Cases affected by this decision
Distinguishes Castle v. Hayes Freight Lines, Inc. (348 U.S. 61)
The Court left open whether this 1954 case limits the Port's penalty enforcement, declining to apply it given the undeveloped record.
Reaffirms American Airlines, Inc. v. Wolens (513 U.S. 219)
The Court relied on Wolens's distinction between government regulation and voluntary contractual commitments.