Automotive Fleet
MenuMENU
SearchSEARCH

Know Your Stopping Distance: Why it Matters More than You Think

A single second can mean the difference between a crash and a safe stop. Here’s how reaction time and speed impact stopping distance.

March 26, 2018
Foot pressing car brake pedal, illustrating driver reaction time and its impact on stopping distance and overall vehicle safety.

Stopping distance depends on more than braking. Reaction time plays a critical role in how quickly a driver can respond and avoid a crash.

Credit: Automotive Fleet

3 min to read


What can a one-second advantage mean to your fleet drivers?

Ad Loading...

Everybody wants the gift of more time, but how valuable could just one measly, crummy second be to you? When it comes to using your vehicle's brakes on the highway, it could mean – well, a whole lot more than you might imagine. 

Ad Loading...

Your reaction time plus stopping distance equals where your vehicle finally comes to a rest. Studies have shown that it takes the average driver from one-half to three-quarters of a second to perceive a need to hit the brakes, and another three-quarters of a second to move your foot from the gas to the brake pedal. 

Everybody’s reaction times are different, but that’s up to a full one-and-a-half seconds between when you first start to realize you’re in trouble and before you even start to slow down. And what happens after you stop your vehicle is why this matters, often the difference between a crash and a safe stop. 

This is fundamental – there’s no changing human physiology.  But let’s look how that affects your ability to stop your car. 

Time to Stop Your Car

The table below shows the distances it takes an average car to come to a stop on dry pavement from different speeds, including the distance traveled for just one second of perception and reaction time:

Speed

Perception/Reaction Distance

Braking Distance

Overal Stopping Distance

Equal to Approx Number of Car Lengths (@15 feet)

30 mph

44 feet

45 feet

89 feet

6

40 mph

59 feet

80 feet

139 feet

9

50 mph

73 feet

125 feet

198 feet

14

60 mph

88 feet

180 feet

268 feet

18

70 mph

103 feet

245 feet

348 feet

23

80mph

117 feet

320 feet

439 feet

29


Notice that when you double your speed – say, from 30 mph to 60, or 40 to 80 – your total stopping distance more than doubles: it triples!

Ad Loading...

When it comes to braking, always follow these three key defensive driving principles: 

  • Keep your speed down. The slower you drive, the shorter your stopping distance.

  • Look far ahead to increase your warning time. By always looking as far down the road as you can, you’ll see emerging hazards and the brake lights of cars ahead of you sooner.

  • Move your foot early. By taking your foot off the gas and pressing on the brake pedal lightly at the first sign that you need to slow down, you get a jump on your reaction time, and you protect your backside by giving drivers behind you an earlier warning sign.

A classic study conducted in the 1980s found that 90% of all accidents could have been avoided if the driver had reacted just one second earlier. Using these tips for safe braking might just give you the one-second advantage you need.

Another added benefit of better brake use and understanding stopping distance? Improved fuel economy! By knowing when to push the pedal, when to coast, and when to use your brakes, you will increase your vehicle's fuel efficiency! 

Stay up-to-date on everything fleet safety by signing up for our eNewsletters today! 

Subscribe to Our Newsletter

More Safety

Safe Driving on Halloween over spooky fall road
Safety•by Staff•October 25, 2026

Tips for Driving Safely on Halloween Night

This video features a reminder from the Connecticut Department of Transportation (DOT) and the Connecticut Police Chiefs Association, urging drivers to prioritize safety this Halloween.

Read More →
a crash test dummy in a car
Safety•by Jeanny Abraham•October 22, 2026

IIHS Crash Avoidance Tests Reveal Safety Gaps in Cargo Vans and Work Trucks

New IIHS crash avoidance ratings show uneven performance among cargo vans and heavy-duty pickups, with most struggling to avoid vehicle-to-vehicle collisions.

Read More →
AN AF news recap thumbnail
Safety•by Faith Howell•October 16, 2026

What’s Next for Fleet? Safety, AI & Industry Recognition | AF News Recap

Could your company's culture be encouraging distracted driving? This week, we're exploring how workplace expectations affect driver safety, what AI, EVs, and autonomous vehicles could mean for the future of fleet management, and how fleet professionals can strengthen their award nominations.

Read More →
Ad Loading...
a man driving with a cell phone in his hand.
Safety•by Jeanny Abraham•October 14, 2026

Does Your Fleet's Culture Encourage Distracted Driving?

What happens when the people responsible for enforcing safety rules are the ones setting the wrong example? The answer may reveal why some of the biggest risks to fleet drivers have little to do with what's written in the employee handbook.

Read More →
Motorq Whitepaper Cover - Fleet Managers Ultimate Playbook
Sponsored•October 1, 2026

Fleet Manager’s Ultimate Playbook: Navigating the New Standard in OEM Connectivity

Rising operating costs, driver safety concerns, and unplanned downtime are putting unprecedented pressure on modern fleets. Discover how fleet managers use embedded OEM connectivity and real-time vehicle data to cut TCO, prevent downtime, and protect drivers without aftermarket telematics hardware.

Read More →
An AF news recap thumbnail with a woman pointing at the title "From driver well-being to EV charging"
Safety•by Faith Howell•September 21, 2026

From Driver Well-Being to EV Charging | AF News Recap

Mental health belongs in the fleet safety conversation. This week, we’re looking at five ways fleets can support employee well-being before a crisis, plus Holman’s expansion in Mexico, new one-day Fleet Forward passes, and why EV charging demand is outpacing infrastructure growth.

Read More →
Ad Loading...
Nexar and nauto logos
Safety•by Staff•September 15, 2026

Nexar-Nauto Merger Aims to Give Fleets Better Safety Intelligence Through Larger Driving Dataset

Stefan Heck tells Automotive Fleet that combining more than 10 billion miles of driving history with Nexar's AI models will give fleets deeper insights into driver risk and roadway conditions than either company could provide independently.

Read More →
Two fleet employees talk beside work trucks beneath the words “Mental Health Is Fleet Safety,” highlighting the connection between employee mental health and fleet safety.
Safety•September 15, 2026

Don't Wait for a Crisis: 5 Ways to Build Mental Health Into Your Fleet Safety Program

For Suicide Prevention Month, fleet and safety leaders have an opportunity to put mental health where it belongs: at the center of workplace safety.

Read More →
hands covering toy car with digital widgets surrounding it
Safety•by Chris Brown•September 1, 2026

How Camera Data Can Strengthen a Fleet’s Insurance Renewal

Insights from a commercial insurance carrier and a broker show how fleets can turn video telematic data, driver coaching, and improved claims results into a stronger case at insurance renewal.

Read More →
Ad Loading...
An image to reflect an article on how the safest fleets aren't the ones with the most tech.
Safety•August 11, 2026

The Safest Fleets Aren’t the Ones with the Most Technology

You’ve made the telematics investment. Here’s how to capture the other half of its value and build the safest fleet on the road.

Read More →