APPLICATION OF DEVELOPED SYSTEM

5.1       INTRODUCTION

The developed system is applied to study area Adyar Taluk and East Cost Road. 

API And WSI Methods is used to analyse the accident data

            Accident-prone stretches of different roads may be arrived by the number accidents per unit length of the road. The methods namely Accident Prone Index (API) method and Weighted Severity Index (WSI) method have been adopted to identify the accident prone spots of NH4 and NH46. The methods are briefly enumerated below.

a)         Accident Prone Index Method (API)

            In this methods the index value per unit length is computed based on the number of accidents occurred. It consists of three major components viz.

1. consistency
2. tendency
3. level

The rating of accidents according to the above-mentioned factors is given below in table 5.1.

Table 5.1 Rating of Accident Components

SL.NO	ACCIDENT COMPONENTS	POINTS
	Consistency (maximum points 30) 1.     One or more than one accident every year.                                             2.     One or more than one accident for two years. 3.     One or more than one accident for one year only. 4.     No accident in three years.	30 20 10 00
	Tendency Two time increase in three years. One time increase three years. No increase No accident in three years	30 20 10 00
	Level Number of accidents three years 6 and above. Number of accidents three years between 2 & 5. Number of accidents three years between 1 & 2. No accident in three years.	40 30 20 00

      By using the above table, the score for any stretches can vary from 0-100. the stretches having the maximum score of hundred have been taken as more- accident prone.

 

b)               WEIGHTED SEVERITY INDEX

 

            In this method, the points are given according to the severity of accidents and the points for various type of causalities adopted are

 

                        For fatal                                  -           32        points

                        For grievous injury                  -           9          points

                        For simple injury                     -           1          point

 

            The weighted severity index can then be computed as follows. Firstly, the weighted severity total (WST) for each stretch has to be computed.

 

                         

And then it has to be normalized with respect to traffic volume as indicated below.

                       

                        WST (J)-WEIGHTED SEVERITY TOTAL

                        A                     - Number of accidents of i ^th type viz.fatal, grievous injury                                                      and simple injury.

                        W                    - Weight of i ^th type of accident

                        WSI(j)             - Weighted severity index for j^th stretch         

                        PCU(j)             - Volume of traffic in passenger car units on j ^th stretch

                        K                     - 10,000, a constant factor

 

 

 

 

5.2       ECR ROAD

5.2.1    DESCRIPTION OF ACCIDENT PRONE STRETCH

 

Table 5.1 Accident Prone Stretches

 

 

Among the number of accident, 41% of the accidents are due to Pedestrian, Animal crossing and Skidding which may be avoided.

 

 

 

Accident prone stretches which required immediate attention

Ø     Pedestrian affected locations

                        Kizhpettai     (km 125) – Chetty Nagar   (km 130)

Ø     Skidding

                        Uthandi         (km   25) - Muthukadu       (km 30)

                        Sadras           (km  90) – Odiyur              (km 95)

                                            Particularly at Paramankany (km 91)

Ø     Head on Collision

                        Uthandi         (km  25) – Kovalam             (km 35)

                        Chetty nagar (km 130) – Kizhputhupattu ( km 135)

 

5.1.2    ACCIDENT LOCATION IN ECR

 

Classification of accident spot according to the total number of accident

 

Fig5.1 Accident location on East Cost Road

 

Fig5.2  Fatal Accident spot on East Cost Road

 FATAL ACCIDENTS

        Fig 5.3 shows the detail of fatal accident location on East Cost Road. The stretches from 31 – 41.5, 127 – 135 has more number of fatalities.

Fig 5.3 Detailed fatal accident location on East Cost Road

Fig 5.4 Continuation of detailed Fatal accident location on East Cost Road

 

Fig5.5 Grievous accident location on East Cost Road

 

 

 

Fig5.6 Simple accident location on East Cost Road

 

 

GREVIOUS & SIMPLE INJURY

Fig  5.7 shows the Grievous and simple accident location. High accident prone stretches are identified based on the number of accident and severity

 

 

5.7 Detailed Grievous accident location on East Cost Road

 

Fig5.8 Continuation of  Detailed Grievous accident location on East Cost Road

 

SKIDDING

                        The stretches from 24 – 41.5 & km 91  has more number of accidents due to skidding.

 

Fig5.9 Skidded accident location on East Cost Road

 

Fig5.10 Continuation of Skidded accident location on East Cost Road

PEDESTRIAN, BICYCLIST & CATTLE CROSSING AFFECTED LOCATIONS

                  The stretches from 22 – 32, 37 – 41.5, 44.5 – 46.5, 119 – 135 requires immediate attention to reduce accidents.

 

 

Fig5.11 Pedestrian accident location on East Cost Road

 

Fig5.12 Continuation of Pedestrian accident location on East Cost Road