2026 LGV Theory Practice Test – Complete Exam Prep

In wet weather the biggest drop in your forward visibility at speed comes from spray thrown up by the tyres of vehicles ahead. That spray forms a curtain of water right in front of your windscreen, which can obscure your view very quickly as you travel fast. Windscreen wipers clear water from your screen, so they generally improve visibility unless the blades are worn or the screen is dirty. Headlights can cause glare, but they don’t reduce the road view as directly as spray does. When vehicles are close, more spray is produced, increasing the problem, but the core issue remains the spray itself obscuring your vision.