Why does your 2000 Nissan Maxima overheat when stuck in traffic?
The most likely culpret is a faulty radiator fan relay or a
blown fuse. Fans are intended to force air through the radiator
when the car is sitting still and reaches about 200 degrees F. If
you turn your A/C on the fans should operate all the time. If the
fans operate for A/C you may have a faulty temperature sensor.