Engineers in the New South Wales Department of Main Roads have developed three traffic devices with a unique versatility. They are all designed to move in some way and guide traffic into improved flow conditions. The need for these devices usually arises on roads or bridges subject to reversible (tidal) traffic flow. To improve the flow on the warringah freeway, which leads to the sydney harbour bridge, sliding signs are used. Two sets of signs bearing different legends are employed, one set being displayed, the other stored behind those being displayed or behind a special blank storage panel. The signs are electrically operated. On the Sydney Harbour Bridge one-way toll was introduced in July 1970. This ment that when the traffic flow was reversed some booths were not needed. The problem was solved by adapting electrically operated tractors to act as movable toll booths. In the centre of many roads the raised dividing strip, the median, is a most effective means of dividing traffic. For locations where reversible traffic flows occur a fixed median is not appropriate. A movable median has been developed which can be moved on its spring-loaded wheels using the power from an electric power pack. /TRRL/

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Filing Info

  • Accession Number: 00125110
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Nov 18 1975 12:00AM