RED means 'Stop'. Wait behind the stop line on the carriageway
RED AND AMBER also means 'Stop'. Do not pass through or start until GREEN shows
A GREEN ARROW may be provided in addition to the full green signal if movement in a certain direction is allowed before or after the full green phase. If the way is clear you may go but only in the direction shown by the arrow. You may do this whatever other lights may be showing. White light signals may be provided for trams
GREEN means you may go on if the way is clear. Take special care if you intend to turn left or right and give way to pedestrians who are crossing
AMBER means 'Stop' at the stop line. You may go on only if the AMBER appears after you have crossed the stop line or are so close to it that to pull up might cause an accident
Flashing Red Lights
Alternately flashing red lights mean YOU MUST STOP.
At level crossings, lifting bridges, airfields, fire stations, etc
Motorway signals
Change lane
Leave motorway
at
next exit
You MUST NOT proceed further in this lane
Temporary maximum speed advised and information message
Lane ahead
closed
Reduced
visibilty
ahead
Temporary
maximum
speed advised
End of restriction
Lane control signals
Green arrow - lane available to traffic facing the sign. Red crosses- lane closed to traffic facing the sign. White diagonal arrow- change lanes in direction shown
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Rules and regulations - Latest 2007 
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