1) First lap leader 2) Important Indy 500 vehicle 3) Indy guide 4) Indy leader 5) Indy safety vehicle 6) Leader at indy 7) Leader of some parades 8) Leader of the track 9) One to follow at Indy 10) Pre-race leader 11) Race leader that never wins 12) Racetrack non-participant 13) Racing safety vehicle 
[n] - (auto racing) a high-performance car that leads a parade of competing cars through the pace lap and then pulls off the course
noun a high-performance car that leads a parade of competing cars through the pace lap and then pulls off the course
Seen at racing meets, the pace car leads race cars into their pole positions at the beginning of races, or after a yellow flag or restart has been called.
The car which leads the field to set the pace before starts and restarts after cautions.