To be most effective advance destination sign should be placed distance of 300 to 500 ft from intersection; for multi-lane highways it is desirable to use separate sign for each lane; letters should be not less than 12 in. in height and preferably 15 or 18 in.; sign should be at height of not less than 17 ft above road.
Overhead signs for better traffic control
Pub Works
Public Works ; 88 , n 3
1957
2 pages
Article (Journal)
English
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