Praatpalen : een nadere beschouwing van een aantal oriënterende botsproeven die in opdracht van de Werkgroep Bermbeveiligingen in 1971 zijn gehouden op "De Vlasakkers" te Amersfoort. (Herziene versie).

Impact test with three types of roadside telephone pillars were analyzed. The construction of the telephone pillars were different as regards the thickness of their inner tube and the way in which their different components were fixed together. The improvements in construction are discussed.