• k.Nandini Chandravathi
• Dr.K.M.Lakshmana Rao
• S.Arun Kumar

The ungovernable increase in usage of motor vehicles on the road has created a major social problem – the loss of lives through road accidents. The atrocious human misery and significant economic loss caused by road accidents demand the attention of the society and call for solution of the problem. A multi-disciplinary approach is needed in understanding the problem and providing solutions. The Study area of NH-67 covering a length of 80kms from Nagapattanam to Tanjavur is chosen as a study area. The road layout plan has been exported from CAD to Arc GIS for georeferencing. In this study area, the geometric factors increasing accidents are collected by using Tools like Arc GIS, Google earth & Auto CAD. From the data collected, the factors which are incorrect those are responsible for increasing the accidents are sorted out by comparing the values with IRC Specifications. The sorted out values are converted into co-ordinates(x, y). Then all the factors are divided into three combinations with standard values and present values. The accident increasing rate is estimated by triangle model methodology in these following steps like Representing in Triangles , Finding the distance between the centroids, deriving Lagrange Interpolation Equation, Integrating the derived equation with respect to distance as the limit. After integrating we get a value and it is taken as accident rate.

Georeferencing, Triangle Model, Increasing Accident Rate, Centroid, Lagrange Interpolation Equation

"GIS and Modelling Interface for Sustaining Road Safety-Positive Externality Perspective", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.5, Issue 3, page no.171-176, March-2018, Available :http://www.jetir.org/papers/JETIR1803036.pdf

"GIS and Modelling Interface for Sustaining Road Safety-Positive Externality Perspective", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.5, Issue 3, page no. pp171-176, March-2018, Available at : http://www.jetir.org/papers/JETIR1803036.pdf