Two types of signs at 12 study locations in Central Illinois were divided into four groups; Division of Highways used ball-bank indicator to determine critical speed of curves; testing conditions are given and data tested by analysis of variance and t-test computations were processed by electronic computers and 95% Confidence Interval was used; driver response to signs is discussed and data are tabulated.
Influence of horizontal curve advisory speed limits on spot-Speeds
Traffic Eng
Traffic Engineering ; 36 , n 12
1966
5 pages
Article (Journal)
English
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