The Romans became expert at constructing roads, which they called "viae". It was permitted to walk or drive cattle, vehicles, or traffic of any description along the road. The "viae" differed from the many other smaller or rougher roads, bridle-paths, drifts, and tracks. By law, the minimum width of a "via" was fixed at 2.4 m where it was straight, and 4.9 m where it turned.