Related Clues:

• 22-Across sight
• Where to find the colors in this puzzle
• Device that signals the ends of 17-, 36- and 58-Across
• With a clear road it may still hold you up
• I across warning lets off cars by remote control
• Can go green all of a sudden? That will hold you up!
• A shining contribution to road safety, implying little likelihood of holdups?
• Business not strong, but one wants it to be green
• Signal of everyone staying at home?
• Few vehicles about, but this will control them
• Amber can go red when you're in full flow?
• 1 across is one part of this system for releasing jaguars, for example, by remote control
• Bring in people illegally on plane taking off from Capital - some people will see red when they see this
• Amber stops 26 across
• The Buick stops here presumably for Amber