Possible Clues:

• Signal of everyone staying at home?
• I across warning lets off cars by remote control
• Few vehicles about, but this will control them
• *Red, yellow and green circles
• Amber can go red when you're in full flow?
• Vehicle flow controller
• 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
• *It's constantly changing