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Commercial & Fleet

The most complete low-clearance bridge database in the world.

The largest, most accurate, and best maintained low-clearance dataset anywhere. 26,000+ verified structures across the U.S., U.K. and Canada, and the same data our own routing runs on.

Open Database Portal Explore the API
26,000+ curated structures
3 countries covered
CSV · XLSX · JSON & GeoJSON
Two ways in

Choose the access that fits your workflow

Most teams start with the Database Portal for analysis and one-off pulls, then add the API when they’re ready to automate. You can use either, or both.

Database Portal

Replaces the quarterly CSV email

A secure, self-serve web portal for your team. Log in to view the live database, search and filter it, and download exactly what you need. No more waiting for a quarterly file.

  • View, search, filter & sort all 26,000+ records in your browser
  • One-click download as CSV, Excel or JSON, full or filtered
  • Built-in Change Report: diff a previous version to see what’s new
  • Always current, with your live subscription status on-screen
Log in to Portal Request access

API Suite

REST · JSON / GeoJSON

A clean REST API for developers. Query clearance data by route, radius, state, country or structure ID and drop the results straight into routing engines, TMS, and fleet-management tools.

  • Endpoints for route, radius, state, country & ID lookups
  • Filter by vehicle clearance; JSON or map-ready GeoJSON output
  • Safe Route: the same clearance-aware routing behind our app & Headroom Turn-by-Turn
  • Simple X-Api-Secret header auth, issued per account
View API docs Request API key
Side by side

Which option is right for you?

 Database PortalAPI Suite
Best forAnalysts, ops & planning teamsEngineers & product integrations
Access methodSecure web loginREST API key (X-Api-Secret)
Get the full datasetYes: CSV, Excel, JSONYes: JSON / GeoJSON
Filter & search visuallyYes, in-browserVia query parameters
Route & radius lookupsNoYes
Clearance-aware safe routingNoYes: Safe Route API
Change / diff reportsBuilt inBuild your own
AutomationManual downloadsFully programmatic
Setup effortNone, just log inLight integration
What's in the data

Available metadata

Every structure carries core location and clearance fields, plus a rich annotation layer built for height-critical routing decisions.

Core record
FieldWhat it captures
Structure_IDUnique identifier for each structure.
NameThe structure's name or the road / feature it carries.
LatitudeDecimal latitude of the structure.
LongitudeDecimal longitude of the structure.
CountryCountry: United States, United Kingdom or Canada.
StateState or region code.
ClearanceKnown vertical clearance, in feet.
Hazard_HeadingsApproach heading(s), in degrees, where the hazard applies.
Annotation layer
FieldWhat it captures
structure_typeThe kind of overhead structure (coded).
carriesWhat sits on top of the structure (coded).
clearance_varHow clearance varies across the opening (coded).
postedWhether a height sign is visible (Y / N).
posted_rawThe sign value exactly as shown, e.g. 12'-6" or 3.8m.
clearance_min_inControlling (lowest) clearance in inches. The value the router uses.
clearance_max_inHighest clearance in inches, recorded when clearance varies.
Controlled vocabularies
structure_typeThe kind of overhead structure
  • BR Bridge / overpass
  • TRU Truss
  • TUN Tunnel
  • CVB Covered bridge
  • OBS Other overhead obstruction
  • OTH Other / unclassifiable
carriesWhat sits on top
  • ROAD Road / highway above
  • RAIL Railroad above
  • PED Pedestrian / bike only
  • MIX Multiple or other
  • N/A No road above
clearance_varWhere clearance is lowest
  • UNI Uniform (flat soffit)
  • ARC Arched / center-high
  • SLP Sloped / asymmetric
  • STEP Stepped / separate spans
26,000+Curated low-clearance structures
3Countries: U.S., U.K. & Canada
ContinuousUpdates as new data is verified
4Formats: CSV, XLSX, JSON, GeoJSON
Getting started

Up and running in three steps

1

Tell us about your use case

Send a quick note using the form below. Let us know whether you want the portal, the API, or both, and how you plan to use the data.

2

We provision your access

We’ll set up your portal login and/or issue an API key, and confirm licensing terms for your account.

3

Integrate & go

Log in to start downloading immediately, or follow the API reference to integrate clearance checks into your systems.

Request access

Let’s get your team set up

Tell us a little about what you need and we’ll get back to you, usually within one business day, with access details and pricing tailored to your use case.

Commercial access inquiry

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By submitting, you agree to be contacted about Low Clearance Map commercial access.

Request received

Thanks for reaching out. Our team will review your request and get back to you, usually within one business day.