city, traffic, cars, road, rule, boston, usa, united states, seat, district, urban area, pattern, United States of America, wheeled vehicle, convention, America, capital, vehicle, metropolis, practice, auto, U.S., United States, urban center, motor vehicle, state capital, center, car, route, north american country, automobile
I like the way rules are posted on different surfaces in the USA. In most countries you will not see these written directions - "only" or "left lane must turn left". They use just signs and knowledgeof foormal rules.
In the City