Slow Worms are definitely not fast enough! Along with the adders these photos show road fatalities, which for these reptiles is more common during the nice sunny weather when they come out to bask in the sun.
With long, smooth, shiny, grey or brown bodies, slow worms look very similar to tiny snakes, in fact they are legless lizards and are quite harmless. Slow worms like humid conditions and emerge from their hiding places at dusk or after rain to hunt for food. They spend the winter hibernating under piles of leaves or within tree roots. If attacked by a predator, a slow worm can shed its tail to escape, although it never grows back fully.
Please remember to curb your speeds on moor roads as it is not just birds and sheep at risk but also these protected snakes.
All snakes in the UK are protected under The Wildlife and Countryside Act 1981: Schedule 5 and it is an offence to kill, injure or take a native snake. There are three native species (grass snake, adder and smooth snake) and one legless lizard (slow-worm), which may be confused for a snake.