We are here during Easter week so you do expect things to be busier than usual.  Traffic is fierce.  The roads through the center of town were not made with cars in mind.  Horses, donkeys, and carts would have worked better a hundred years ago.  Today it would be nicer if it was limited to bikes and pedestrians and maybe some of those three wheeled motocarts we saw in Juchitan. The sidewalks are narrow.  There are three pedestrian only streets so that helps with walking.