Autobahn-Tempolimit
The A45 and its speed limit
The A45 is 254.2 km long. Of that, 165.2 km have no speed limit (65%) – here are the exact figures, the longest open stretch and where the limit applies.
The A45 in numbers
| Category | Length | Share as bar |
|---|---|---|
| Total length | 254.2 km | |
| no speed limit | 165.2 km | |
| fixed limit | 50.8 km | |
| variable (gantry) | 14 km | |
| no limit recorded | 21 km |
The longest open stretch
In one go without a limit you can drive up to 71.6 km on the A45 (per carriageway) – the longest continuous derestricted section of this Autobahn. On the interactive map you can follow exactly where the limit drops and where it returns.
Enter start and destination and see how much of your drive is open – and what that means for travel time.
How the figures are produced
The basis is our own analysis of the freely available OpenStreetMap data. For every section of the A45 we check whether a speed limit is recorded and sum the length by category. “No limit recorded” means the tag is missing in the data – which is not the same as open road. This is a data-based analysis, not an official survey.
Frequently asked questions
How much of the A45 has no speed limit?
165.2 km of the total 254.2 km, i.e. 65%. The remaining 89 km have a fixed limit, are gantry-controlled or have no recorded limit.
How long is the longest open stretch on the A45?
Up to 71.6 km in one go – the longest continuous derestricted section on the A45 (per carriageway).
Does the A45 have variable speed limits?
Yes, about 14 km of the A45 are controlled by overhead gantries. There a limit can be shown even where the road is otherwise open.
Data source: our own analysis of OpenStreetMap speed limits, as of 29 August 2026. Kilometres averaged per carriageway. Not an official survey.