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DCAN 15: Vehicular Access Standards
Table B: Y-distance (m) and Forward Sight Distance (m)

                                   Traffic Speed on the Priority Road kph (mph)
Type of Access 120 (75) 100 (62) 85 (53) 70 (44) 60 (37) 50 (31) 40 (25) 30 (19)
Access other than those listed below 295 [215] 215 [160] 160 [120] 120 [90] 90 [70] 70 [45] 45 [33] 33
Access flow up to 60 vpd onto priority road >3000 vpd 215 160 120 90 70 60 45 33
Access flow up to 60 vpd onto priority road <3000 vpd 215 [160] 160 [120] 120 [90] 90 [70] 70 [45] 60 [33] 45 [33] 33
Notes
  1. In exceptional circumstances a reduction in the visibility standards may be permitted where, in the judgement of the Department, danger to road users is not likely to be caused. Where exceptional circumstance are considered to exist, it is highly unlikely that the Department will permit visibility standards which fall below the figures in the square brackets.
  2. In the case of single or paired dwelling accesses a reduction in the visibility standards may be acceptable where, in the judgement of the Department, there is a slightly lower risk of conflict, particularly when traffic on the priority road is light.
  3. Reductions in visibility standards will not be permitted simply because the applicant does not control the required visibility area or does not have a reasonable prospect of bringing it under his control.
  4. Traffic volumes are in vehicles per day (vpd) and refer to the total combined flow in both directions. Volumes on the priority road include traffic generated by the development.
  5. If there is a dispute about the predicted minor road (access) traffic flow, it shall be determined by reference to a recognised database such as TRICS3, or failing that by a direct survey of a similar existing development over an acceptable period.
  6. The traffic speed to be used is a reasonable estimate of the 85%ile speed on the priority road; for example, by use of following vehicle surveys or, in the case of a dispute, the measured 85%ile speed.
  7. Where actual speed falls between the given values the y-distance may be interpolated.
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