In Copenhagen, it is possible to drive to and from Nordhavnen through a special transit route in a vehicle that does not meet the requirements for particulate filters.
In Aalborg, Vesterbro and Strandvejen from west of the city to Limfjord Bridge is a transit route. Everyone can drive on these roads. The transit route has been designated to provide the option for traffic to drive via Limfjord Bridge if the Limfjord tunnel is blocked. Special transport, which is not allowed to drive through the Limfjord Tunnel, can also use the transit route.
See the low emission zones and the transit routes here.