From Arrl News, An update concerning the use of handheld communications devices while driving has been issued by the California Legislature.
While not intended to eliminate the use of Ham Radio devices, the wording of the update can easily be misinterpreted to do just that. Read the update carefully and you may avoid an expensive ticket. Use of Amateur Radio walkie-talkies or a handheld microphone is no longer guaranteed an exemption. The ARRL is working on getting clarifications and when they are published circumstances will still depend on interpretation by law enforcement.
Go to the ARRL News tab (above right) to read the entire update.