Comment by alwillis
5 hours ago
“Pacing the frontier” is similar to the role of a “pace car” in racing.
From https://en.wikipedia.org/wiki/Safety_car
> In motorsport, a safety car, or a pace car, is a car that limits the speed of competing cars or motorcycles on a racetrack in the case of a caution period, such as an obstruction on the track or bad weather.
Yes, but I think part of the problem is that it's a very US term, used in nascar and indycar. The rest of the sports/world use safety car.