ROAD SIGNS >> SIGNS GIVING POSITIVE INSTRUCTIONS
Signs with blue circles but no red border mostly give positive instruction.
For a fully comprehensive guide to UK driving regulations visit the Highway Code web site.

Signs Giving Positive Instructions One Way Traffic Turn Left Ahead (Right if Reversed) Turn Left (Right if Reversed) Keep Left (Right if Reversed) Ahead Only Minimum Speed End of Minimum Speed Mini Roundabout   Route To Be Used By Pedal Cyclists Only Segregated Pedal Cycle & Pedestrian Route Vehicles May Pass On Either Side