Contra Costa County voters will decide Nov. 2 whether to pay $10 higher car registration fees each year to fight potholes and gridlock, the Contra Costa Transportation Authority decided Wednesday night.

The commission voted unanimously to place the ballot measure before county voters. The bulk of the $8.5 million of annual revenue from the fee would be spent to maintain city and county roads.

A new state law says that county congestion management agencies can sponsor the ballot measures, which require a simply majority vote to pass.

The Contra Costa County Taxpayers Association contends the fee is really a tax subject to a two-thirds vote requirement.

Alameda, Santa Clara, San Francisco and San Mateo counties already have scheduled ballot measures on a car registration fee increase.