The existing rules of the road have been crafted and tweaked over the long life of the automobile, updated to reflect inventions and innovations such as turn signals, headlights, cell phones, and HOV lanes.
Ang umiiral na mga panuntunan ng kalsada na-ginawa at tweaked sa ibabaw ng mahabang buhay ng mga sasakyan, na-update upang sumalamin imbensyon at makabagong-likha tulad ng mga pagliko signal, headlights, mga cell phone, at HOV lane.