Parking: Housing Mrs. Spelman To ask the Minister of State, Department for Transport whether he has made an estimate of the proportion of households affected by (a) yellow line and (b) controlled parking zone restrictions in each year since 1997. Mr. Khan The introduction of yellow line parking restrictions or controlled parking zones are matters for individual local authorities, following appropriate consultation. No central record is kept of these local decisions, and the Government have made no estimate of the proportion of households affected.