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The study concluded the increase of speed limits not only increases the speed of vehicles but can also generate additional deaths: "A 5 mph increase in the maximum state speed limit was associated with an 8.5% increase in fatality rates on interstates/freeways and a 2.8% increase on other roads."
The story is set in the near future, when "roadtowns" (wide rapidly moving passenger platforms similar to moving sidewalks, but reaching speeds of 100 mph) have replaced highways and railways as the dominant transportation method in the United States. Heinlein's themes are technological change and social cohesion.
When highway speed limits drop suddenly just as the road enters a municipality that collects large amounts of revenue from traffic tickets, a safety hazard can be introduced, and efforts have been made in the U.S. to ban this practice. [47] Some police forces have even been forced to disband as a result of overzealous enforcement. [48]
The definition of a road depends on the definition of a highway; there is no formal definition for a highway in the relevant Act. A 1984 ruling said "the land over which a public right of way exists is known as a highway; and although most highways have been made up into roads, and most easements of way exist over footpaths, the presence or ...
Variable speed limit signs - used for varying the posted speed limits within work zones and in emergencies. Portable VMS: movable "electronic VMS". A portable VMS has much the same characteristics as a fixed electronic VMS, but can be moved from location to location as the need dictates.
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The legislation reauthorized the Federal-Aid Highway Act through the end of fiscal year 1976 (September 30, 1976). Appropriations were made for interstate highway construction through fiscal year 1979 (September 30, 1979). [15] The total cost of the legislation was $20 billion over fiscal years 1974, 1975, and 1976.