Traffic Down is a stunt type in Asphalt 8: Airborne.
Overview[]
A Traffic Down being performed on a pickup truck in Tokyo
Traffic Downs are performed by ramming Traffic. If the player's vehicle is wrecked during the collision, a Traffic Down will not be registered. Each Traffic Down will refill the nitro bar by 10% and awards 
5 at the end of the race for each successful Traffic Down.
Traffic Downs are referred to as "Traffic Knockdown" by the game in the post-race screen and player profile.