The iowa legislature passed a law banning trucks 65 feet long or longer from operating on its roads and highways because big trucks do more damage to roads than smaller trucks and are involved in more serious accidents. consolidated freightways (cf) drove big trucks through iowa on a regular basis, and these trucks were legal in other states. switching to smaller trucks for trips through iowa was inconvenient and costly. cf filed a lawsuit contending that the statute was unconstitutional. the court most likely found that the iowa statute was:

unconstitutional under the "dormant" commerce clause.

Explanation:

The Commerce Clause (Article 1, Section 8, Clause 3 of US Constitution) state that Congress has the power "to regulate commerce with foreign nations, and among the several states, ..."

The dormant commerce clause refers to limitations on state powers, which cannot pass any law that excessively burdens or discriminates against interstate commerce. Only Congress has the power to regulate interstate commerce.

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