Lapped

 The idea is that the front‑runner passed cars that were a full circuit behind. A few clear paraphrases:

• The leader overtook the slower cars by a whole lap.

• The leader went around the track fast enough to pass cars that were behind by a full circuit.

• The leader caught up to and passed the slower cars even though they were a lap behind.

• The leader completed an extra lap compared to the slower cars and passed them.