In order to control the traffic, there are traffic lights almost at every intersection. Red lights effectively stop traffic and green lights effectively start traffic. There is a bit of chaos when the light changes. Like in some European countries, the light flashes red and yellow several times before it turns green. Drag racing anyone? Coming to a complete stop on a red before making a right turn is a recipe for disaster since no one does it. Left turn arrows are usually obeyed. On a road with little traffic, blowing the horn can be a substitute for stopping at a red light.
Lanes are clearly marked and are usually effective at controlling vehicles until there is a backup. Then only curbs and medians can control the flow.
There are two basically two classes of drivers on the road, professional drivers (taxi/bus/chauffeurs) & new drivers (everyone else). There are very helpful street signs for the new drivers.
Stop signs which are ubiquitous in the US are a rare sight here since they would either be ignored, cause accidents if actually obeyed, or necessitate a traffic light. We have caught one so far, along with a rollerblader with a bag of oranges in hand.
