Explanation: An amber flashing light on a vehicle indicates that it's slow-moving. Battery-powered vehicles used by disabled people are limited to 8 mph. It isn't advisable for them to be used on dual carriageways where the speed limit exceeds 50 mph. If they are, then an amber flashing light must be used.
Category: Hazard awareness
References: The official DVSA guide to driving: section 10, Highway code: rule 220