supply and grub
It's a car that follows the last of the racers, to pick up anyone too tired/injured to go on. Sometimes called the broom wagon as well.
The Peloton
Track cycle racing.
52 spokes on a racing cycle
sag
Le tour de France
SAG
The past tense of sag is sagged.
Spectators often do want the participants to die. Look at the romans. Look at motor racing, motor cycle racing, drag racing. The public has a vicarious taste.
Plenty of antique car collectors want to buy a 1965 Ford Falcon wagon. Many people fix these vehicles up for car shows and even for racing.
The sag setting is necessary because it is physically impossible to have a suspended line with no sag. The sag is specified because there has to be a minimum clearance value for the height above ground at the centre of the sag where the cable is at its minimum height.
Sag lasers measure distance.