People v. Plank
Annotate this CaseThe Illinois Vehicle Code prohibits anyone with a revoked driver’s license from driving a “motor vehicle.” 625 ILCS 5/6-303(a); such an individual may still drive a “low-speed gas bicycle.” Section 1-14-.15 defines “low-speed gas bicycle” as a “2 or 3-wheeled device with fully operable pedals and a gasoline motor of less than one horsepower, whose maximum speed on a paved level surface, when powered solely by such a motor while ridden by an operator who weighs 170 pounds, is less than 20 miles per hour.” Plank, charged with driving a motor vehicle with a revoked license, claimed that the definition of “low-speed gas bicycle” was unconstitutionally vague. The Illinois Supreme Court held that the definition of “low-speed gas bicycle” satisfies due process requirements. The statutory language means that a defining characteristic of a low-speed gas bicycle is an engine that is incapable of transporting 170 pounds at 20 miles per hour without help from gravity or pedaling. A bicycle’s motor will either have this capability or not, regardless of the weight of any particular driver. The vagueness doctrine is not implicated every time officers cannot conclusively determine at a glance whether someone has violated a statutory provision. Once someone is charged with violating section 6-303(a), the prosecutor has the burden of proving the elements of the crime beyond a reasonable doubt—including that the bicycle at issue had a strong enough motor to qualify as a “motor vehicle.”
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