We have carefully reviewed "Evaluation of the California Smog Check Program and Recommendations for Program Improvements: Fourth Report to the Legislature." Overall, we find it a thorough and competent presentation of the basic facts, though we disagree with the conclusions. Our major concern is...

I arrived here at the UC Transportation Center just nine months ago. A former lawyer and aspiring writer, I had only a layman's knowledge of transportation systems, mostly based on my personal experiences.  Growing up in Hilo, Hawaii, I thought traffic jams meant having to circle the parking...

Reducing emissions of pollutants from cars requires that new vehicles be designed and built to pollute less, and also requires some ongoing inspection and maintenance programme to ensure that a vehicle's operation conforms to those design standards. This paper focuses on these programmes,...