6304 Cross-roads is a LEGOLAND (Theme) set released in 1980. It contains two baseplates imitating a vehicle crossroad from a typical highway.
Each of the plates has the dimensions of 27 studs by 27 studs. There are four buildable areas which each have the dimensions of 9 by 9 studs. The rest of the area is flat and designed for LEGO vehicles to be able to rid over. They are designed to be integrated into a builder's custom town.