David Cummins claims that posted speed limits correspond with the design speeds of roads, so exceeding a speed limit is inherently unsafe (Letters LTT 16 Dec). Even if so many local authorities were not arbitrarily reducing speed limits below the design speed, the latter is not a good indicator of a maximum safe speed under normal weather and traffic conditions.
The design speed determines certain geometric criteria for a road alignment, such as minimum curve radii and stopping sight distances....
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