If you’ve ever driven down a rural backroad at midnight, you know the difference between a dim, flickering street light that casts long, sharp shadows and a steady, bright glow that lets you see the deer darting from the tree line before they step into your lane. For the past seven years, I’ve worked as an LED street light supplier—mostly talking to city council members, public works directors, and small town mayors who are juggling tight budgets, aging infrastructure, and pressure to cut carbon emissions. The question I get asked most often, more than “How much is a light?” or “How long do they last?” is this: Can LED street lights actually make roads safer? LED Street Light
I used to answer that question with numbers and specs. I’d talk about lumen output, color temperature, and the difference in how LED light travels compared to the old high-pressure sodium (HPS) bulbs that most cities have used since the 1960s. But over the years, I’ve realized the answer isn’t just about science—it’s about real people. Like the small-town police chief in western Pennsylvania who told me that since his town swapped out the last of the HPS lights on State Route 422 two years ago, nighttime pedestrian accidents have dropped by 28%. Or the mom in Ohio who reached out last month, saying her 16-year-old son crashes his truck on that same stretch of road every winter, but hasn’t had an accident since the LEDs went in last fall. Those stories stick with me because they aren’t from marketing brochures—they’re from the people who drive those roads every day.
Let’s start with the basics: what makes LED street lights different from the lights they replaced. Most traditional street lights use HPS technology, which produces a warm, yellowish light that’s relatively dim compared to LEDs and takes 10 to 15 minutes to reach full brightness when turned on. LEDs, by contrast, turn on instantly, put out between 50 and 150 lumens per watt (compared to HPS’s 50 to 100 lumens per watt), and can be tuned to different color temperatures. Early LEDs had a bad rap for being too harsh—like staring into a flashlight— but modern models use lens technology that softens the light and directs it exactly where it’s needed, instead of spilling it into the sky (a big win for reducing light pollution, too).
Now, how does that translate to road safety? Let’s break it down by the things that matter most to drivers and pedestrians: visibility, reaction time, and how light interacts with the road and the human eye.
First, let’s talk about visibility of objects on the road. Our eyes process two types of vision in low light: scotopic vision, which is our rod-based vision that works in dim light and is most sensitive to blue-green wavelengths, and photopic vision, which is cone-based and works in bright light. Traditional HPS light is heavy on red and yellow wavelengths, which are less visible to our rod cells at night. LEDs can be tuned to a higher color temperature (around 3000K to 5000K, depending on the application) that includes more blue-green light, which activates our scotopic vision more effectively. A 2021 study from the University of Michigan Transportation Research Institute (UMTRI) tested this by having drivers react to obstacles placed along a test road under HPS and LED lighting. Drivers under the LED light spotted obstacles an average of 1.5 seconds faster than under HPS light. That might not sound like a lot, but at 55 miles per hour, 1.5 seconds is more than 120 feet of stopping distance. For someone swerving to avoid a deer, or a cyclist in dark clothing on the shoulder, that extra time is the difference between a near-miss and a crash.
Then there’s the issue of shadows. Old HPS bulbs cast uneven light, creating deep, sharp shadows at the edges of the light’s coverage area. On a two-lane road, that can mean one side of the lane is bright and the other is shrouded in shadow. Pedestrians walking along the shoulder are half-hidden by those shadows, and drivers’ eyes have to constantly adjust between bright and dark areas, leading to eye strain and slower reaction times. LEDs, because they can be precisely aimed and distributed evenly, reduce those harsh shadows. A 2019 study from the Federal Highway Administration (FHWA) looked at 12 cities across the U.S. that had completed full LED street light retrofits between 2015 and 2018. The study found that nighttime fatal crashes on those city roads dropped by 16% on average, and pedestrian nighttime crashes dropped by 23%. The researchers specifically cited the reduction in shadow-related glare and the uniform light distribution as key factors.
I’ve seen this play out firsthand in a small town in northern New York. Last year, their public works department replaced 120 old HPS lights along a 3-mile stretch of Main Street, which was a busy route for local commuters and had a history of pedestrian accidents involving people walking to the downtown shops after dark. Before the retrofit, the town had one pedestrian crash in that corridor every year, on average. In the 10 months after the LEDs were installed, they had zero. The police chief told me that before, when officers responded to accidents, they often noted that drivers “didn’t see the person until they were almost in the road.” With the new lights, he said, “You can see a person walking a block away, even if they’re wearing dark clothes.”
Of course, it’s not all good news. Early LED retrofits had some unintended consequences that actually hurt safety in some cases. In the mid-2010s, a lot of cities opted for very cool, very bright LEDs (above 5000K) that produced harsh glare, similar to looking into a car’s high beams. That glare could temporarily blind oncoming drivers or make it hard to see road signs. A 2017 study from the Insurance Institute for Highway Safety (IIHS) found that roads with these overly bright LEDs had a 10% higher rate of crashes involving oncoming cars than roads with properly tuned LEDs. But that’s not a flaw with LED technology itself—it’s a flaw with how it was installed. Modern LED street lights use advanced lens systems and color temperature tuning that avoid that harsh glare. Most reputable suppliers (including mine) now work with cities to test color temperatures and light levels specific to each road: residential streets use warmer 3000K lights to avoid disturbing nearby residents, while high-speed arterials use 4000K lights that balance visibility and glare control.
Another common concern I hear about is cost. A lot of small towns worry that switching to LEDs will be too expensive, especially upfront. It’s true that LED street lights cost more to purchase and install than old HPS bulbs. But the long-term savings are enormous, and those savings directly translate to more money that cities can spend on road maintenance and safety. LEDs last 20 to 25 years, compared to 5 to 7 years for HPS bulbs, so cities don’t have to spend money on frequent replacements or maintenance. They also use 50 to 75% less energy than HPS bulbs, which means lower utility bills. I worked with a town in Vermont that spent $120,000 to retrofit all of their 800 street lights to LEDs in 2020. Their annual energy and maintenance costs dropped by $45,000, and they recouped their initial investment in less than three years. That’s money they could put toward pothole repairs, crosswalk upgrades, or additional speed limit signs—all things that also improve road safety.
There’s also the less talked-about benefit of adaptive lighting. Modern LED street lights can be paired with motion sensors or smart controls that dim the light when there’s no traffic on a road, and brighten when a car or pedestrian approaches. A 2022 study from the European Transport Safety Council found that adaptive LED lighting reduced nighttime crash rates by 30% on rural roads, where traffic is sparse most of the night. On roads with consistent traffic, dimming the light slightly when it’s not needed reduces light pollution and energy use, without sacrificing visibility. For example, a rural collector road that only has one car every 10 minutes can run at 30% brightness until a vehicle is detected, then jump to full brightness—giving drivers the visibility they need without wasting energy or creating unnecessary glare.
But I’ll be the first to say that LED street lights aren’t a silver bullet. They work best when they’re part of a broader road safety strategy, not a replacement for well-maintained roads, clear signs, or safe driving habits. I always tell my clients that LEDs will only improve safety if they’re installed correctly: at the right height, with the right spacing, and with the right color temperature for the road type. A poorly installed LED light—too bright, too high, too far apart—can be just as dangerous as a dim, flickering HPS bulb.
Take the example of a suburb outside of Chicago that swapped out all their lights to LEDs in 2018, but skipped the proper testing. They used 5000K lights on residential streets, which created so much glare that drivers couldn’t see pedestrians stepping from driveways. That town actually saw a 7% increase in pedestrian crashes in the first year after the retrofit, until they worked with their LED supplier to adjust the color temperature to 3000K and add shielding to the lights to reduce glare. After that fix, crash rates dropped back to their pre-retrofit levels, then fell another 12% the following year. That’s a perfect example of why it’s not the technology that fails—it’s the implementation.
Over the past seven years, I’ve talked to hundreds of clients, and I’ve noticed a pattern: the cities that see the biggest safety gains from LEDs are the ones that approach retrofits with a focus on the people who use the roads, not just the numbers on a spec sheet. They work with suppliers who will test light levels on their specific roads, listen to concerns from residents and police, and prioritize uniformity and low glare over maximum brightness. They partner with their utility companies to take advantage of energy rebates that offset upfront costs, so they can invest in more of those small, high-impact safety upgrades.
For me, the answer to “Can LED street lights improve road safety?” is a resounding yes—when done right. It’s not a quick fix, and it’s not a replacement for good planning and maintenance, but it’s one of the most effective, long-term investments a city can make to protect the people who drive, walk, and bike on their roads. That’s why I’ve spent my career working to make sure every city, no matter how big or small, has access to high-quality, properly tuned LED street lights that meet their specific needs. If you’re a public works director, city council member, or anyone responsible for road safety in your community, and you’re ready to talk about how LED street lights could help improve safety for your residents, I encourage you to reach out to our team to discuss a customized plan for your roads.
Resell References
Federal Highway Administration. (2019). LED Street Lighting Retrofits: Impacts on Road Safety and Energy Use. U.S. Department of Transportation.
Insurance Institute for Highway Safety. (2017). Nighttime Crash Risks Associated with High-Color-Temperature LED Street Lighting. IIHS Highway Loss Data Institute.
University of Michigan Transportation Research Institute. (2021). Scotopic Visibility Improvements from LED Street Lighting and Their Impact on Driver Reaction Time. UMTRI Technical Report.
European Transport Safety Council. (2022). Adaptive LED Street Lighting: A New Tool for Reducing Rural Nighttime Crashes. ETSC Report.
Zhongshan Flying Lighting Co., Ltd.
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