Term of the Road Dictionary

design speed

  • Language : PIARC Road Dictionary / English
  • Theme : Roads Design Geometry
  • Definition : Speed selected in designing a new road or in modernizing, strengthening or rehabilitating an existing road section, to determine the various geometric design features of the carriageway that allow a car to travel safely at that speed, under normal road surface and weather conditions. Note: the design speed is not constant, but may vary depending on the conditions of relief (plain, hill, mountain).

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