Q: What is the Stopping distance at 30 mph?

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Stopping Distance = about 315 feet at 70 mph

The total stopping distance for a car travelling at 30 mph on a dry surface is about 75 feet. However, you may wish to note that in most countries, driving a car on the pavement is illegal.

1/2 mile

You should not be travelling on a pavement at 70 mph!

The distance to stop depends upon a lot of factors, eg:type of road surfacecondition of tyresstate of road surface (icy, dusty, wet, dry, etc)effectiveness of brakesThe stopping distance given in the Highway Code is based on assumptions that have not changed even though brakes, etc have improved. They are calculated as distance to stop in ft = (speed in mph)² ÷ 20For 50 mph the physical stopping distance is 50² ÷ 20 = 125 ftThe Highway Code gives the emergency stopping distance as this distance plus the thinking distance which is given as 1 ft per mph which at 50 mph is 50 ftThese distances are converted to metres:Emergency stopping distance = thinking distance + physical stopping distance= 50 ft + 125 ft = 175 ft≈ 15 m + 38 m ≈ 53 mThis is the shortest distance based on good brakes, good tyres, dry road. For worn tyres, wet or icy roads, etc increase the distance by a factor of 2, 5, 10 etc.

Related questions

When traveling 30-mph, the braking distance is 45-feet, and the total stopping distance is 75-feet. This is the length of a semi-truck and trailer.

23 meters on a dry pavement.

Stopping Distance = about 315 feet at 70 mph

23 meters in normal conditions

Stopping Distance = 15 feet

The total stopping distance for a car travelling at 30 mph on a dry surface is about 75 feet. However, you may wish to note that in most countries, driving a car on the pavement is illegal.

Stopping Distance = about 146.25 feet.

Stopping distance at 40mph = 36m

1/2

1/2 mile

Most cars can stop from 60 mph in about 100 feet or so. If the relationship is linear then a car should stop from 30 mph in about 50 feet.

There isn't a direct linear relationship between speed and stopping distance with locked brakes. The stopping distance increases exponentially with speed due to factors like increased kinetic energy and reduced tire grip at higher speeds. It's not accurate to calculate the stopping distance at 90 mph just by extrapolating from the data given for 30 mph. Specialized calculations or tests are needed to determine the stopping distance at 90 mph.