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Verified structures mapped
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Data at a glance
The trusted data behind
The trusted data behind
every safe route
27143+ low-clearance structures across the US, UK and Canada, each one geolocated, height-verified and tagged with directional hazard data. Here’s exactly what’s inside.
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structures
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US states + DC
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re-verified < 5 yrs
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lowest on record
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US states + DC, plus the UK & Canada
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Re-verified within the last 5 years
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Lowest clearance on record
Coverage
Coverage you can count on
From dense northeastern corridors to the open West, the database spans every US state plus the UK and Canada. Hover any tile to see how many low-clearance structures we’ve verified there.
Verified structures by US state
By country
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countries
Clearance heights
How low do they really go?
An inch matters. We record the measured clearance for every structure, not a rounded guess, so you know exactly what you’re driving toward.
Distribution of clearance heights
All 27143 structures
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Average clearance
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Median clearance
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sit under 14’, below a standard trailer
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Lowest single structure on record
Direction-aware
Hazard headings, not just dots on a map
Every structure is tagged with the compass directions of travel it affects. That’s how we suppress false alerts, so you only get warned when you’re actually heading toward the hazard.
Hazard headings by direction
Every point has a bearing
Headings are stored as the directions traffic passes under the structure, the raw signal routing engines need.
Fewer false positives
If you’re on the safe side of an overpass, you won’t get a needless alert. Cleaner alerts mean drivers trust the system.
Ready for your geofences
Directional metadata drops straight into custom routing and geofencing logic, with no post-processing required.
Freshness
Fresh data, continuously re-verified
Roads change. Bridges get repaved, signs get replaced, clearances shift. We re-check structures against dated street-level imagery so the database stays current, not frozen in time.
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verified in the last 2 years
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verified in the last 5 years
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most recent verification
Verifications by year
Why teams trust it
Built to be relied on
Dated, visual verification
Each structure is checked against time-stamped street-level imagery, so every clearance is backed by something you can see.
Directional metadata
Hazard headings on every point let your system alert the right drivers and skip the rest. It’s the detail most datasets leave out.
Continuously updated
New structures, corrected heights and improved metadata land on a rolling basis. Commercial clients get fresh CSV drops or live API access.
Multi-source & growing
Public records, technology-assisted detection and on-the-road driver feedback are cross-checked into a single trusted layer.
Build on the most trusted low-clearance dataset
License the full database through API or CSV for fleets, routing platforms and mapping products, or start routing your own trips today.
Common questions
FAQ
Everything drivers and data teams ask before they rely on us.
What is Low Clearance?
Low Clearance means there’s not enough space between the road and a bridge, tunnel, or overpass for taller vehicles to pass safely. If your truck, RV, or trailer is too high, you could hit a Low Clearance bridge. Always check clearance signs before you go through. A few extra seconds could save you a lot of trouble.
How does Low Clearance Map support bridge clearance for trucks?
Our routing system includes accurate height clearance for trucks. That means you can avoid costly or dangerous clearance issues. Once your route is ready, you can send directions straight to Google Maps for easy navigation.
How accurate is the data?
We check our bridge height clearance info using public records, tech-based tools, and feedback from drivers. Every point also has directional info (called Hazard Headings), so you only get alerts that match your direction. This helps cut down on unnecessary road hazard warnings.
How often is the data updated?
We update the map whenever new details come in. This includes newly identified structures, changed bridge height clearances, and improved metadata. If you’re a commercial client, you get regular CSV updates or live access through our API, so your system always stays current.
Do you offer a free version?
Low Clearance Map is a subscription-based service built to maintain high-quality bridge height clearance information. Individual users can sign up for a monthly plan with no long-term commitment. The plan includes unlimited truck and RV routing, and Google Maps integration, with no long-term commitment required.
What’s included in commercial access?
Commercial users can access the full bridge clearance database through API or CSV download, allowing full integration into custom apps, routing platforms, and fleet management tools. This enables in-house generation of road hazard alerts, custom routing engines, and more. Contact us to discuss licensing terms and data delivery formats.
What are Hazard Headings?
Most bridge height clearance tools don’t include directionality, but Low Clearance Map does. Each low clearance bridge includes a Hazard Heading that tells you which direction the road hazard affects. If you’re on the safe side of a bridge or tunnel, you won’t get a false warning. This improves the accuracy of your route, improving routing logic and driver experience.
What regions do you cover?
We currently cover the United States, Canada, and the United Kingdom. Each bridge and tunnel location is geotagged with its height clearance, direction info, and relevant metadata to support both individual and enterprise-level routing.