Darker morning and evenings, rain, fog, to mention a few conditions that affect how you might see the road and other road users.
Visibility for the vulnerable

Darker morning and evenings, rain, fog, to mention a few conditions that affect how you might see the road and other road users.
DVSA's enhanced rider scheme:
The subjects covered include areas of your riding you want or feel you need to improve. The aim is to help you become a better and safer rider.
Your best defence for driving safely is clues to what might happen next and giving yourself time and space to deal with them