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?

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

An image to reflect an article on how the safest fleets aren't the ones with the most tech.
SafetyAugust 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 →
Cover of the AgileFleet white paper "Hidden in Plain Sight: Fleet Compliance Risks" with the AgileFleet logo and a photo of fleet vehicles parked outside a government building.
SponsoredAugust 7, 2026

Hidden in Plain Sight: Fleet Compliance Risks

Fleet compliance isn't just about having policies — it's about consistently enforcing them. This practical guide reveals six hidden compliance risks common in public sector and shared fleet operations and outlines proven strategies to improve visibility, accountability, and audit readiness

Read More →
conference attendees watching a speaker
Safetyby StaffAugust 6, 2026

NETS Sets 2026 Fleet Safety Benchmark Conference for Indianapolis

The Sept. 15–17 program will feature fleet benchmarking data, case studies, emerging technologies, and implementation strategies while running alongside the NSC Safety Congress & Expo.

Read More →
Ad Loading...
NETS crash statistics overlaying an accident photo
Safetyby Chris BrownAugust 5, 2026

Off-the-Job Crashes Account for 43% of Employers’ $61.7 Billion Crash Burden

NETS quantifies costs dispersed across fleet, risk, HR, and other departments while providing new per-crash benchmarks for employers.

Read More →
red ram recall image
Safetyby Faith HowellAugust 3, 2026

Ram Recalls More Than 1.27 Million 1500 Pickups for Seat Belt Anchor Issue

The recall affects certain 2019-2026 Ram 1500 pickups that may have improperly attached second-row seat belt buckle anchors.

Read More →
Promotional graphic for a Utilimarc guide titled How Better Visibility Cut Speeding Violations by 48% featuring a call-to-action to download the guide.
SponsoredJuly 17, 2026

How Better Visibility Cut Speeding Violations by 48%

Fleet leaders don't need more data, they need clearer visibility into what the data is saying. This case study explores how one utility replaced speeding-event counts with a single metric — miles driven in violation — to strengthen safety and significantly reduce speeding violations.

Read More →
Ad Loading...
Smiling commercial truck driver gives a thumbs-up from inside a tractor cab during Operation Safe Driver Week 2026, highlighting fleet safety, responsible driving and enforcement awareness.
Safetyby Judie NuskeyJuly 16, 2026

Operation Safe Driver Week: Why the Industry's Oldest Safety Campaign Still Matters to Fleets

A look at how a 2007 enforcement initiative became one of the most consequential weeks on the fleet safety calendar, and what it means for your drivers in 2026.

Read More →
Nexar and nauto logos
Safetyby StaffJuly 13, 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 →
A black square with white color font text
SponsoredJuly 2, 2026

From Silos to Solutions: Relationship Management for Safer Fleets

From telematics adoption and driver accountability to policy consistency and risk mitigation, this episode breaks down what it really takes to build a safer fleet culture without slowing business down.

Read More →
Ad Loading...
IIHS HLDI text overlaid on the trunks of pick up trucks.
Safetyby Chris BrownJuly 2, 2026

IIHS Launches First Commercial Vehicle Safety Evaluations

The Insurance Institute for Highway Safety has begun evaluating heavy-duty pickups and cargo vans for driver protection. Which models earned top marks?

Read More →