Resource Center
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Data & ResearchHow Many Waymo Cars Are There?
Waymo does not maintain a live public counter for its robotaxi fleet. Its federal software recall filings, however, provide an unusually detailed record. Each filing states how many vehicles carried the affected...
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Data & ResearchHow Many Flock Cameras Are In the US?
As of July 17, 2026, independent mapping has verified 95,923 Flock Safety cameras in the United States. Flock itself now puts its network at more than 120,000 cameras across 49 states, which...
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Data & ResearchRoundabouts by State: Which States Have the Most Roundabouts?
Roundabouts are no longer rare in the United States. A July 2026 extraction of Kittelson’s live U.S. roundabout data lists 15,269 roundabouts and traffic circles across the country. The updated data also...
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Sign BasicsHow to Install a Road Sign
Installing a road sign correctly comes down to placement, height, post stability, and visibility. The sign should be easy to see, mounted at the right height, and attached without bending the panel...
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GuideHighway Emergency Numbers by State
When something goes wrong on the road, the safest number to remember is 911. Use 911 for a crash, injury, fire, blocked lane, dangerous debris, impaired driver, stranded vehicle in an unsafe...
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Sign BasicsWhat is a Yield Sign?
A yield sign means slow down, look for traffic, and be ready to stop. You do not always have to stop at a yield sign, but you do have to let the...
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GuideMost Common Street Names in the U.S.
Every town seems to have a Main Street, and the data backs that up. Main St is the most common street name in the United States, appearing in 9,361 cities in the...
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MUTCD & ComplianceMUTCD by State: Which Traffic Control Manual Applies Where
If you are bidding, ordering, or installing traffic signs in a new state, the National MUTCD may not be the only document you need to check. Some states adopt the National MUTCD...
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GuideSpeed Limits by State 2026: US Map and Table
Speed limits vary by state, roadway type, and local posting. This guide compares the highest posted speed limits across the United States, then breaks the data down by rural interstates, urban interstates,...
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Buying GuidesRoad Sign Sizes Explained: MUTCD Minimum, Standard & Oversized Signs
Learn how MUTCD sign sizes work, including minimum, conventional, and oversized signs for regulatory signs, warning signs, school signs, and more.
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MUTCD & ComplianceMUTCD 2026 Update: What Road Sign Buyers Need to Know
The 11th Edition MUTCD replaced the 2009 version, and states were required to adopt it by January 18, 2026. Learn what changed, what to check, and how to plan sign replacements.
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Sign BasicsRoad Sign Colors Explained: What Each Color Means
Every standard road sign color in the United States carries a traffic-control meaning. Red means stop or prohibition. Yellow means warning. Orange means temporary traffic control. Green guides drivers toward permitted movements...
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