Coulthard thinks that ' by definition , all street circuits are demanding , not technically , as average speeds are usually not so fast .
They all demand maximum concentration all the time , as kerbs and barriers are very near the edge of the track .
Coulthard thinks that ' by definition , all street circuits are demanding , not technically , as average speeds are usually not so fast , but they all demand maximum concentration all the time , as kerbs and barriers are very near the edge of the track .