A skid mark typically appears very light at the beginning of the skid getting darker as the skid progresses and comes to an abrupt end if the vehicle stops at the end of the skid.
(the skid; getting; darker) (the skid; progresses; ) (the skid; comes; ) (the vehicle; stops; T:at the end of the skid)
the skid the skid the skid the vehicle
getting progresses comes stops
darker
T:at the end of the skid