What does it mean if the driver in front gives this arm signal?

Explanation: This arm signal means the driver is turning left. It may be necessary to use arm signals if you know the view of your indicators is restricted. Familiarise yourself with arm signals by looking at a copy of The Highway Code. Make sure you won't get them confused, as a 'slowing down' signal can look similar to the 'turning left' signal.

Category: Road and traffic signs