DENVER (AP) – Colorado lawmakers passed legislation to study whether to require snow tires or chains to drive on a mountainous stretch of Interstate 70 during spring and winter months.

The proposal on its way to Gov. John Hickenlooper’s desk is a watered-down version of what was initially introduced. House lawmakers wanted non-commercial vehicles without four-wheel drive to have tires with snow-appropriate tread or else carry chains from November to May. The goal was to prevent traffic congestion from accidents.

But the Senate turned the bill into a study of the issue.

The House on Wednesday agreed with the Senate position, passing the bill on a 34-29 vote. Several lawmakers who were upset that the proposal was turned into a study asked that their names be removed as co-sponsors from the bill to show their displeasure.

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