The traffic in Sucre isn’t so bad, except around 12-2pm when children finish school and people usually have their 2 hour lunchbreak. What you do need to take care about is yourself as a pedestrian in the traffic, because drivers don’t care if you have a green light to pass the street, they might even toot at you.
“Micros” are the local buses in Sucre, sometimes they leave behind quite some smoke in the city where dogs live like landlords a bit out of control.
They’ve tried to introduce bus stops, and they did as a copy from modern societies, but some things just don’t have to function everywhere. Buses don’t stop and they roll with open doors.
To get on the bus you must signal with your hand and it stops, and getting off where you want is as easy as saying “parada” (stop) or “voy a bajar” (I want to get off). Spice that with “por favor” at the end and you’ll be the best bus rider in Sucre.