[san rensho]

Using the clutch to slow the car a sign of someone who doesn't know how to drive.

Downshifting is used make sure you are in the right rpm range for the gear you are in. Never use a downshift to slow the car.

Race car drivers never use a downshift to slow the car. When approaching a second gear corner, for example, a racer will never use a downshift to slow the car. He will brake hard and at the same time downshift and rev match so the clutch is never used to slow the car.