Noun
backmarker (plural backmarkers)
A racer who holds a poor rank or is lapped in a race.
At the Portuguese Grand Prix at Monsanto Park, Brabham was chasing race leader Moss when a backmarker moved over on him and launched the Cooper into the air. Source: Internet
Senna dominated 1989 while Prost was stuck behind backmarker has-been Rene Arnoux and others; the Brazilian also dominated 1990 and 1991. Source: Internet
In the 1965 race he took pole position and led from the start, but went up an escape road on lap 25 to avoid hitting a slow backmarker. Source: Internet