There’s never been a solar eclipse during rush hour before, and motoring groups are worried drivers will spend more time looking at the sky than the road.
Distracted drivers might be a particular issue in towns, where lower speeds may make them feel more comfortable with looking up at the sky: schools are expected to warn pupils and parents to be extra-cautious.
The partial solar eclipse will begin at 8h24am in London and last until 10h41am. Its peak will be 9h31am; in the UK capital, it will be an 84 per cent eclipse.
Further north, the eclipse will be bigger. In Edinburgh, for example, watchers can expect a 93 per cent eclipse, beginning at 8h30am with the peak at 9h35am.