Recently moved to CA, got all the driver's handbooks, here's what i found, anyone/everyone feel free to comment/correct/or add to: A motor-driven cycle is defined as a motorcycle with a 149cc or less engine size. A motorized bicycle is defined as a two-wheeled device capable of no more than 30 mph on level ground, and equipped with 1. fully operative pedals for human propulsion, and 2. a motor producing less than 2 gross brake horsepower and an automatic transmission. If you operate a motorized bicycle that meets the above, you, 1. must be at least 16 yrs old, 2. must wear a properly fitted and fastened bicycle helmet, and 3. are EXEMPT from motor vehicle financial responsibility, drivers license, and moped plate requirements. You may ride in the bicycle lane at a reasonable speed so long as you are mindful of other cyclists using the lane.