What does this arm signal mean?

Explanation: There might be an occasion where another driver uses an arm signal. This may be because the vehicle's indicators are obscured by other traffic. In order for such signals to be effective, all drivers should know their meaning. Be aware that the 'left turn' signal might look similar to the 'slowing down' signal.

Category: Road and traffic signs

References: The Official DVSA Guide to Driving: Section 6, Highway Code: Page 103