The Scientific World Journal / 2014 / Article / Tab 4

Research Article

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

Table 4

Conditions of traffic safety parameters.

Traffic safety parametersCondition

Traffic speedSpeed differential more than 8 km/h
Through trafficThru traffic more than 50% of total traffic
Accident rateNumber of accident resulted from speeding more than three per year
Parking occupancyParking occupancy more than 50% in narrow street
Heavy vehicleHeavy vehicle volume more than 25% of total traffic

Width of streetsMore than one on each direction or the width of traffic lanes more than 3 meters
Length of streetsUnimpeded length more than 200 m in local streets and 300 m in collector street
GradeGrade more than 8%
Horizontal or vertical curvesSharp curves or Visibility problems

SidewalkNo sidewalk or usable shoulders
Bike laneNo bike lane in street with cycle volume more than 200 per day
CrosswalkUncontrolled crosswalk with pedestrian volume more than 200 per day
IntersectionUncontrolled intersections with speeding problems
Street lightingNo street lighting
Bus stopsExistence of bus stops

DensityResidential areas with more than 90 dwelling units per hectare
SchoolExistence of primary schools or kindergartens
Trip generatorsExistence of more than three major trip generators or commercial streets in 300 m length of a street
Residential complexesLack of safety measures