Source: Land NRW (2017) Datenlizenz Deutschland -Namensnennung - Version 2.0 (http://www.govdata.de/dl-de/by-2-0)
Key
Moterways (Autobahn): red
Federal Highway (B51): blue
Regional Streets: green
TIM-Online
TIM-Online, official open data access to many maps of Nordrhine-Westfalia 