Determination of Non-Registration Rates for On-Road Vehicles in California

摘要

The State of California now requires vehicle owners to show proof of insurance before it will issue or renew a vehicle's registration. Proof of emissions compliance is also required every other year for 1974 and newer vehicles. It is believed that these new measures have led to increases in the number of unregistered vehicles in the state - especially poorly maintained vehicles that cannot pass a smog test. Numerous studies have demonstrated that high-emitting vehicles are a significant source of emissions in California. Identifying and either repairing or retiring high-emitting vehicles is a high priority for CARB. The objectives of this CARB-sponsored project were to determine the portion of in-use vehicles in California that are unregistered and to assess the number of out-of-state and out-of-country vehicles in use in California. With this information, CARB can update emissions inventories and develop regulatory strategies to reduce emissions from this subset of the vehicle population.