Related Clues:

• Obeyed a flasher
• Exercised caution, in a way
• Lost momentum
• Hit the brakes
• Inhibited
• Unable to proceed
• Obstructed
• Decelerated
• Congested
• Frustrated
• Hindered
• Went from 60 to 40, e.g.
• Applied the brakes
• Cramped
• Lost speed