ODOT Approved Speed Zones by Posted Limit

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The map shows 57,896 ODOT speed zones currently in effect, about 14,800 miles in total, colored by posted limit.

ODOT Approved Speed Zones by Posted Limit⬇ Image

Legend: posted limit, in mph

Click a segment to see its route, street, county, authority, status and approval date.

What the map does and doesn't show:

• Source: ODOT's Speed Zones inventory. It only lists places where ODOT approved a limit different from the default speed set by state law.
• Roads without a zone aren't drawn: Most rural two-lane roads (55 mph by default) and most interstates don't have a zone record, so they don't appear. The map is not a complete picture of every road's limit.
• What I kept: zones with status "Approved" or "Active", no withdrawal date and a valid speed.
• What I dropped: withdrawn, deleted, under-review and denied requests, plus about 8,400 records with a speed of 0 or blank.
• Which roads: Interstate, US, state, county, township and municipal routes are all included, because ODOT approves zones on all of them. Most zones are on county and township roads, and the orange 45 mph zones cover the most miles.

If you want only the state highway system (interstate, US and state routes), I can filter to those. I can also add the 55 mph default roads from the Road Inventory, which would give fuller coverage but those limits would be inferred rather than recorded.