Plus, your back is going to get sore just waiting at a red light. Or would you just take the crosswalk? Now that I think of it, I don't even think this is street legal. At least according to my reading of the CA vehicule code, a "rider" on this contraption would be considered a pedestrian.
Originally Posted by CA Vehicle Code
Pedestrian
467. (a) A pedestrian is a person who is afoot or who is
using any of the following:
(1) A means of conveyance propelled by human power
other than a bicycle.
(A bicycle is defined as "a device upon which any person may ride, propelled exclusively by human power through a belt,
chain, or gears, and having one or more wheels.")