728.A road is classed as a gravel road when it has received a uniform coating of not less than 22 cm of gravel for its whole length, and for a width of at least 2 m, after having the road-bed specially prepared.
728.A road is classed as a gravel road when it has received a uniform coating of not less than nine inches of gravel for its whole length, and for a width of at least seven feet, after having the road-bed specially prepared.