Vehicle condition. You MUST ensure your vehicle and trailer comply with the full requirements of the Road Vehicles (Construction and Use) Regulations and Road Vehicles Lighting Regulations (see'The road user and the law').
90. Rules for drivers and motorcyclists - Fitness to drive
Make sure that you are fit to drive. You MUST report to the Driver and Vehicle Licensing Agency (DVLA) any health condition likely to affect your driving.
91. Rules for drivers and motorcyclists - Fitness to drive
Driving when you are tired greatly increases your risk of collision. To minimise this risk
make sure you are fit to drive. Do not begin a journey if you are tired. Get a good night's sleep before embarking on a long journey
avoid undertaking long journeys between midnight and 6 am, when natural alertness is at a minimum
plan your journey to take sufficient breaks. A minimum break of at least 15 minutes after every two hours of driving is recommended
if you feel at all sleepy, stop in a safe place. Do not stop on the hard shoulder of a motorway
the most effective ways to counter sleepiness are to drink, for example, two cups of caffeinated coffee and to take a short nap (at least 15 minutes).