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Why are stopping distances for braking cars increased on wet roads?
Wiki User
∙ 13y ago
The water gets into the brakes and when you stop there is less friction.
Wiki User
∙ 13y ago
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Why are stopping distances for breaking cars increased on wet roads?
The wet road surface has less friction as the water interacts with the rubber and acts somewhat like a lubricant
How do worn tires affect braking distance?
It has long been known that a decrease in tyre tread depth can lead to the deterioration of a tyre's performance during cornering, and straight line braking in the wet. A tyre is unable to deal with the same volume of water on the road at lower tread depths, which means that the tyre is unable to transmit traction and braking forces as effectively. Previous studies had confirmed this relationship, however there was a need for independent testing to quantify the effects on typical cars found on today's roads. In 2003, the British Rubber Manufacturers Association (BRMA) commissioned MIRA to study the effects of tread depth on stopping distances. The study was carried out on MIRA's test track in Nuneaton, and 5 different tread depths were tested - 6.7mm, 4.1mm, 2.6mm, 1.6mm (the legal minimum) and 0.9mm. Vehicles were mounted with equipment to record time, speed, and distance. The tests were carried out on two different surfaces at the testing track, hot rolled asphalt and smooth concrete. In order to ensure the accuracy of the results, the tests were repeated several times. The stopping distance was recorded at each of these tread depths and the points plotted on a graph of stopping distance versus tread depth. A line was drawn through the points to show the trend between stopping distance and tread depth, from which information could be taken.
What factors make a car stop more slowly?
Friction. Friction would affect how fast a car stopped (i.e. lots of friction equals fast stopping). The friction would be affected by the road conditions (icy roads less friction), tire condition (wore down gives less friction), mass of car (as if the mass is large it will have more momentum and therefore will be harder to stop, a=F/m so if mass is large deceleration will be smaller) and the reaction time will affect the total stopping time (but not the braking time).
How does surface of car affect car speed?
If the surface is rough/bumpy , the vehicle cant safely go as fast as it can on a smooth road. Also if the car is bouncing, it's aerodynamics will be disturbed causing more drag. Ground clearance also has to be increased on rough roads, causing more drag.
Why do roads shine?
Its an illusion! LOL! :-)
Why are stopping distances for breaking cars increased on wet roads?
The wet road surface has less friction as the water interacts with the rubber and acts somewhat like a lubricant
Why one must drive slowly on wet roads?
Increased stopping distance-danger of hydroplaning
Why doesnt the highway code include stopping distances greater than 70?
The highway code typically includes information that is relevant to the majority of driving situations. Stopping distances greater than 70mph are less common and may be considered atypical. Additionally, including stopping distances above 70mph may give the impression that driving at those speeds is safe, which is not necessarily the case. It is always important for drivers to adjust their speed and maintain a safe stopping distance based on the road conditions and their vehicle's capabilities.
Wet roads reduce traction but have no effect on braking distance.?
True
Why have speed limits changed over the last 100 years?
cars and roads have progressed, enabling more control and stopping performance also a better understanding of safety,some roads reducing speeds where population requires ie near schools, and open road speeds can be increased.
Are abs brakes supposed to come on when braking on dry roads?
Yes , if you are doing a " panic stop "
When driving fifty miles per hours how far will it take you to stop?
On dry, level pavement, with decent tires? About 120 feet. Many things affect this calculation. With worn tires the distance can increase to 210 feet. Dirt roads require longer braking distances than pavement. Ice can increase the braking distance by hundreds of feet. Braking down a hill, depending upon the slope, can double the braking distance, whereas braking up hill can halve that distance. If you lock the tires, you typically increase the braking distance. You can reduce the distance by pumping the brakes. Anti-lock brakes allow the tires to slip, which decreases the braking distance. Extra weight in the vehicle increases the braking distance. Refer to the link below for calculating the braking distance at different speeds with different tire wear on dry, level pavement.
What are the differences between the four major types of roads?
The difference between the four roads are; the expressway is designed to carry huge amounts of traffic quickly over long distances. Arterial roads carry moderate amounts of traffic over shorter distances. Collector roads move traffic from local roads to areterial roads. Local roads that are smaller and narrower than arterial roads.
What are interstates?
A network of roads for the purpose of traveling long distances at an above average speed.
Why does the highway code not include stopping distances for speeds greater than 70 mph?
The maximum speed limit on UK roads is 70mph. If you want to know the stopping distances for speed not given in the Highway Code, then the formula used is: speed ft thinking distance + speed² / 20 ft braking distance where the speed is in mph. eg 20 mph: 20 ft + 20² / 20 ft = 20 ft + 20 ft = 40 ft eg 70 mph: 70 ft + 70² / 20 ft = 70 ft + 245 ft = 315 ft If you want to know what 315 ft looks like, in metres it is 315 × 0.3048 m = 96.012 m which is approx 100m which is the distance between the marker posts along the edge of a motorway - if you need to do an emergency stop to avoid a static object on the road, you need to be looking approximately the distance between the marker posts up the road! The stopping distances have not be changed since they were first included in the Highway Code despite the improvement in car brakes; when I bought my current car in the showroom was a display about tyres and why you should always have good tread: it gave the braking distance for a minimum legal tread (1.6mm) on wet roads from 50 mph the same as what the Highway Code describes as the braking distance from 50 mph using good tyres and a dry road (ideal conditions). Also, when doing the test for a Coach, the same stopping distances are used - a 23 tonne coach (a tri-axle coach which most are these days) running at its limited speed of 100 km/h (62½ mph) will take the (approx) 260 ft (80 m) to stop (at least - the driver's priority is the safety and comfort of their passengers, not the idiot who cuts in front and reduces the available stopping distance), so think very carefully before you pull in front of one and expect it to stop. An articulated lorry will have even more weight and although it is limited to 90 km/h (56 mph), it will still take at least the (approx) 215 ft (65 m) to stop in an emergency (I'd give it 100m to be sure).
Why are the paved city roads at most intersections lumpier and bumpier than the rest of the roads most of the time?
Intersections and locations where vehicles stop and start repeatedly will eventually develope bumps or rises in the asphalt. The stress of vehicles weighing many tons starting and stopping causes the mat to creep or move as a result of the braking and acceleration forces being transferred to the asphalt. Similar to a rug that loses its attachment and moves horizontally.
Did the tang rulers build roads and waterways that increased the trade?
true.. yes
