In WWII, fuel in the US was rationed at 4 gallons (per vehicle per week) then reduced to 3 gallons, and finally in 1944 to 2 gallons. Alongside this a national 35 mph speed limit was imposed and anyone breaking the limit risked losing their fuel and tire rations. The government ran marketing campaigns to support these measures such as advertisements asking “Is this trip necessary” and educations campaigns on “How to spend a weekend without a car”.12
In each of these cases there is a massive network of parallel moving belts, the inner ones faster. Passengers are screened from wind, and there are chairs and even shops on the belt. In the Heinlein work the fast lane runs at 100 mph (160 km/h), and the first "mechanical road" was built in 1960 between Cincinnati and Cleveland. The relative speed of two adjacent belts is 5 mph (8 km/h) (in the book the fast lane stops, and the second lane keeps running at 95 mph (152 km/h)). In the Wells and Asimov works there are more steps in the speed scale and the speeds are less extreme.
The primary conclusion of this research is that the majority of motorist on the nonlimited access rural and urban highways examined in this study did not decrease or increase their speed as a result of either lowering or raising the posted speed limit by 4, 10, or 15 mi/h (8, 16, or 24 km/h). In other words, this nationwide study confirms the results of numerous other observational studies which found that the majority or motorist do not alter their speed to conform to speed limits they perceive as unreasonable for prevailing conditions.
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