Book excerpt: The California Highway Patrol has its roots in the early 1920s motorcycle traffic cops employed by counties and cities. The CHP became a separate state entity in 1929 and has grown from the early traffic enforcement role to that of one of the premier law enforcement agencies in the United States. Their responsibilities range from patrolling the freeways and county roads of California to providing security for the state capital and other state buildings to protecting the governor and visiting dignitaries from around the world. The CHP has marshaled its forces to restore and maintain peace in times of war, civil unrest, or natural disasters.