The First Responder goes to incidents on or off the racing surface, assesses the situation and relays information to the stations. The worker assigned to this duty must understand vehicle velocities and trajectories. A worker responding to an incident with a fire extinguisher can run at about 8 mph. Therefore, to cross a track that is wide will require about 4 seconds, running at full speed. A race car traveling at 100 mph will require only 1/4 of a second to travel the same distance.