Developing a Web-Based Advisory Expert System for Implementing Traffic Calming Strategies

Table 4

Conditions of traffic safety parameters.

Traffic safety parameters	Condition
Traffic speed	Speed differential more than 8 km/h
Through traffic	Thru traffic more than 50% of total traffic
Accident rate	Number of accident resulted from speeding more than three per year
Parking occupancy	Parking occupancy more than 50% in narrow street
Heavy vehicle	Heavy vehicle volume more than 25% of total traffic
Width of streets	More than one on each direction or the width of traffic lanes more than 3 meters
Length of streets	Unimpeded length more than 200 m in local streets and 300 m in collector street
Grade	Grade more than 8%
Horizontal or vertical curves	Sharp curves or Visibility problems
Sidewalk	No sidewalk or usable shoulders
Bike lane	No bike lane in street with cycle volume more than 200 per day
Crosswalk	Uncontrolled crosswalk with pedestrian volume more than 200 per day
Intersection	Uncontrolled intersections with speeding problems
Street lighting	No street lighting
Bus stops	Existence of bus stops
Density	Residential areas with more than 90 dwelling units per hectare
School	Existence of primary schools or kindergartens
Trip generators	Existence of more than three major trip generators or commercial streets in 300 m length of a street
Residential complexes	Lack of safety measures