Regulatory Traffic Signs
Regulatory signs show the course a driver must follow and an action they are required to take or forbidden to take. They are generally circular and have a red border and black symbols or letters on a white background. Mandatory regulatory signs that indicate the direction traffic must take at junctions are blue and white.
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Stop
Yield
Yield
School wardens stop sign 
No left turn 
No Entry 
No right turn
Parking prohibited
Clearway
Max speed limit
30km/h
Max speed limit
50km/h
Max speed limit
60km/h
Max speed limit
80km/h
Max speed limit
100km/h
Max speed limit
120km/h
Taxi Rank
No entry for large
vehicles
(by reference to weight)
No U-turn
No overtaking
Height restriction
Pedestrianised
street
Parking permitted
Disc parking plate
Zonal restriction - no parking of large vehicles
End of the restriction zone
Turn left ahead
Turn right ahead
Turn left
Turn right
Pass either side
Straight ahead
Keep right
Keep left
No entry for pedestrians to tramway
Stop
Either form of Go
or Téigh can be used 
No entry to goods vehicles (by reference to number of axles)
With flow bus lane on left
With flow bus lane on right
Contra flow bus lane
Tram lane on left
Tram lane on right
Start of cycle track
End of cycle track
Electronic variable speed limit sign (tunnel only)
In a tunnel goods vehicles cannot use right-hand lane (by reference to
number of axles)
Electronic periodic speed limit sign
Electronic periodic speed limit sign at school
Tram only street
Tram and access
only street
Bus only street
Go (Lane open)
Stop (Lane closed)
Move into the
left-hand lane
Move into the
right-hand lane