How does rain affect braking distance? I know the Green Cross Code, and safe crossing places on the road. 60mph x 4 = 240 feet. Here we’ll look at how dry weather, rain, snow and ice can affect your stopping distances. Stopping distances. The next bit requires a bit of thought, using 20mph as the base line, the braking distance is equal to the speed in feet,i.e 20mph = 20 feet. At 70mph, the 75-metre braking distance makes up nearly 80% of the overall 96-metre stopping distance. Braking distance is the distance that you travel in your vehicle from when first applying your brakes to that point whereby your car stops completely. Whether it’s coming to a slow, controlled pause at traffic lights or an emergency stop to prevent a collision, it’s vital that you’re able to brake in time when you’re behind the wheel. Stopping distances on wet or icy roads Remember in wet conditions stopping distances are doubled. The following stopping distance chart shows typical CAR stopping distances. “Ice, snow, heavy rain and fog make driving incredibly risky; stopping distances double in the wet and increase ten-fold in ice and snow. Answer: Overall stopping distance at 40mph is 40 x 3 feet = 120 feet. Stopping distances in the rain The Highway Code states that stopping distances will be at least double in wet weather, because your tyres will have less grip on the road. Input your chosen speed, select your conditions and then click Run the Simulator. If you continue to use this site we will assume that you are happy for your browser to receive our cookies. An alert and fit rider needs 0.75 of a second thinking time. Many driving experts will advise all drivers, regardless of how many years they have been driving to avoid such conditions as much as they possibly can. For calculating the stopping distance in feet, simply use this formula: (speed) ² ÷ 20 + thinking distance. The reaction time used is the same as that used by the Highway Code. 70 mph: 70 + (70 × 7) ÷ 2 = 70 + 245 = 315 feet. Highway Code – Stopping Distances in Dry and Rain, Cookies are used on this site to give you the best possible online experience. Though they won’t affect your thinking and reaction distance, you will need to be aware that your overall stopping distance will greatly increase when braking. Leave as much space as you can between your car and the car in front, and always give the road your complete and undivided attention. Below is a chart showing a system for working out the Overall Stopping Distancein feet. The overall stopping distance is really the only safe separation distance. Your stopping distance is actually made up of two factors – thinking distance and braking distance. In an emergency, a driver must bring their vehicle to a stop in the shortest distance possible: stopping distance Chris . This is the distance travelled by your vehicle in the time it takes for you to move your foot from the accelerator pedal and apply it to the brake pedal while pressing down hard in order to slow down vehicle down. Say you are traveling to the standard speed limit of 70mph on the motorway and, according to the Highway Code, your stopping distance overall here should be 315 feet as a guide. This effectively means you are looking at around the 105-metre mark for your stopping distance. Driving in adverse weather conditions (226 to 237) Rules for driving in adverse weather conditions, including wet weather, icy and snowy weather, windy weather, fog and hot weather. Watch when the vehicle in front of you passes that point. Many people find that a visual aid such as this one is one of the most powerful ways of recalling detailed information, rather than having to memorise extended formulas. Read our guide to stopping distances in the rain here, Read our guide to how the condition of your tyres in particular can affect your stopping distances here. At the end of the day, it's a guide and don't forget the most common crash in the UK is by someone ramming the back of a vehicle in front by being too close and not reacting quickly enough. Once you have successfully passed your theory and driving tests, you may want to look at driving out further afield and get a taste of driving on the motorways. There are 3.3 feet in a metre – so divide the distance in feet by 3.3 to get the stopping distance in metres. Chris . When driving any vehicle in any weather conditions, you need to know the safe stopping distances for the different speeds that you are likely to be travelling at. 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