Boris Johnson reminded London’s teens to take care around the capital’s roads yesterday ahead of the clocks going forward this weekend.

The start of British Summer Time will initially cause darker mornings meaning many teens will travel to school in the dark with road collisions involving teenagers most typically occuring on weekdays at peak travelling times.

As part of a Transport for London campaign, rapper Wretch 32 and Being Human actors Lenora Crichlow and Russell Tovey have also created short Youtube videos to reinforce the message of staying safe near roads.

The Mayor of London said: “We want youngsters to remember to take care and keep an eye out for their friends as they travel around the city. “Deaths of youngsters on London’s roads are falling but we will continue to do everything in our power to help drive down needless accidents.”

Ben Plowden, TfL’s director of better routes and places, said: “I urge all teenagers to make sure that they are visible on the roads, particularly when they travel in the dark as that is when they are most vulnerable.”

TfL reported that the number of teens killed on London’s roads has fallen by 23 per cent since 2000, but warned that people should not get complacent.

Posters marking their “Don’t let your friendship die on the road” campaign are now visible across the capital.