Board Thread:Questions and Answers/@comment-4931349-20130129174935/@comment-4939977-20151024040112

Yes, street tracks are technically "built". You just find an unused public road and start the construction of a street circuit by planting billboards and guard rails.

Oh, and did I forget to mention that you also "build" chicanes on a street circuit's long straight, so as to make the cars racing on it slow down? (Got this experience with Circuit de la Sarthe. Starting with the 1990s, two chicanes were added on the Mulsanne straight and they were "built" by the French road workers)