No trailer or semitrailer with a gross weight of load and vehicle in excess of 4,000 pounds shall be operated on the highways of this State at a speed in excess of 10 miles per hour unless equipped with suitable brakes controlled by the operator of the towing vehicle.
36 Del. Laws, c. 10, § 123; Code 1935, § 5661; 21 Del. C. 1953, § 4305.