Beginning the the early 20th century, the 1920's saw several major advancements. There was improvement in rural roads which was significant for the time.The diesel engine, which are 25-40% more efficient than gas engines were also a major breakthrough.We also saw the standardization of truck and trailer sizes along with fifth wheel coupling systems. Additionally power assisted brakes and steering developed. By 1933, all states had some form of varying truck weight regulation.
Without strong land use controls, buildings are too often built in town right along a bypass.This results with the conversion of it into an ordinary town road, resulting in the bypass becoming as congested as the local streets.On the contrary, a bypassis intendedto avoid such local street congestion.Gas stations, shopping centers, along with various other businesses are often built alongside them.Theyare builtin hopes of easing accessibility, while home areideallyavoided for noise reasons.
In 1938, the now-eliminated Interstate Commerce Commission (ICC) enforced the first Hours of Service (HOS) rules. Drivers became limited to 12 hours of work within a 15-hour period.At this time, work included loading, unloading, driving, handling freight, preparing reports, preparing vehicles for service, or performing any other duty in relation to the transportation of passengers or property.
The ICC intended for the 3-hour difference between 12 hours of work and 15 hours on-duty tobe usedfor meals and rest breaks.This meant that the weekly maxwas limitedto 60 hours over 7 days (non-dailydrivers), or 70 hours over 8 days (daily drivers). With these rules in place, it allowed 12 hours of work within a 15-hour period, 9 hours of rest, with 3 hours for breaks within a 24-hour day.
The rise of technological development gave rise to the modern trucking industry.There a few factors supporting this spike in the industry such as the advent of the gas-powered internal combustion engine.Improvement in transmissions is yet another source,justlike the move away from chain drives to gear drives. And of course the development of the tractor/semi-trailer combination.
The first state weight limits for truckswere determinedand put in place in 1913.Only four states limited truck weights, from a low of 18,000 pounds (8,200 kg) in Maine to a high of 28,000 pounds (13,000 kg) in Massachusetts. The intention of these laws was to protect the earth and gravel-surfaced roads. In this case, particular damages due to the iron and solid rubber wheels of early trucks. By 1914 there were almost 100,000 trucks on America's roads.As a result of solid tires, poor rural roads, and amaximumspeed of 15 miles per hour (24km/h) continued to limit the use of these trucks tomostlyurban areas.
With the ending of World War I, several developmentswere madeto enhance trucks.Such an example would be by putting pneumatic tires replaced thepreviouslycommon full rubber versions.These advancements continued, including electric starters, power brakes, 4, 6, and 8 cylinder engines. Closed cabs and electric lighting followed. The modern semi-trailer truck also debuted.Additionally, touring car builders such as Ford and Renault entered the heavy truck market.