http://members.aol.com/rcmoeur/signman.html -- Unofficial Manual of Traffic Signs in the United States
international Convention about traffic sign (governemental Swiss website) (http://www.admin.ch/ch/f/rs/0_741_20/)in French
Diamond Signs (http://www-cs-faculty.stanford.edu/~knuth/diamondsigns/diam.html) – extensive image collection of many North American warning signs, including many non-standard and special-purpose signs
Traffic signs of the world (http://www.intlsigns.com/world/traffic/) – links, pictures and information about road traffic signs all over the globe
French traffic signs according to la sécurité routière web site (France) (http://www.securiteroutiere.gouv.fr/IMG/pdf/LesSignauxRoutiers-2.pdf)in French
With parking signs and street name signs the recommended height from bottom of the sign to ground is 7 feet when pedestrian movement is likely to occur.
Signs installed at the side of the road in rural districts shall be at least 1.5 m (5 ft), measured from the bottom of the sign to the near edge of the pavement.
All route signs, warning signs, and regulatory signs on freeways and expressways shall be at least 2.1 m (7 ft) above the level of the pavement edge.
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