Britons are being warned of massive fines they could face for breaking Highway Code rules during the wetter months, as the DVSA tells motorists to be sensible. Drivers have been urged to be aware of Rule 121 of the Highway Code which ensures that vehicle brakes are tested before setting off, which can be impacted by water. It details: “If you have driven through deep water your brakes may be less effective. Test them at the first safe opportunity by pushing gently on the brake pedal to make sure that they work. If they are not fully effective, gently apply light pressure while driving slowly. …