Key:except - OpenStreetMap Wiki

The except=* key is used to specify that a restriction does not apply to these vehicle types.

Common values

Common values are: psv / bicycle / hgv / motorcar / emergency

Usage

Add the key to a restriciton relation and set the value to a transport mode to which the restriction does not apply.

If you need to set more than one value, separate them with semicolons, e.g. except=bicycle;psv.

See Relation:restriction for more info regarding turn restrictions.