My car overheard every day, I try to avoid traffic, but starts smoking when stoped for 5-10 mins. I've change the radiator, thermostat, waterpump, hoses & its still same problem. Radiator start to boil up too vet high temperatures.
Are the cooling fans coming on when you are in traffic? When moving, the air runs through the radiator to cool it. When sitting in traffic, not moving, the only thing that draws air to cool the radiator is a cooling fan. If it doesn't come on, it will overheat when sitting still.