There is no key access regulation schem in the city you are searching?
But you think there might be one.
Or you want to double-check?
We have a complete dataset for all the cities with a population over half a million, and increasingly other cities (see completeness of data). It may be that for some cities there is a scheme that we don't give details of in the city pages. Or there may be a pedestrian zone that we do not include. For this we have the physical regulation data.
Then check in the physical regulations, as they may have some restrictions there. To find all the schemes in a city, please use the Quick Guide for all Schemes page.
If you are looking for a physical regulation, but can't see them, it may be that you are not zoomed in enough. Zoom in further, and see if this helps.