A GIS for Routing of Oversized and Hazardous Material Carrying Vehicles

A GIS for Routing of Oversized and Hazardous Material Carrying Vehicles

Transport Network
The road layer in digital format has been obtained from GIS Company Mappls. This layer was made with poly lines without following the link, node and chain concepts. The complete layer with 9200 links and 5200 nodes was digitized over the Mappls layer in TransCAD by using map-editing tool. The road network inventory carried out during the MMS identified 19 link types of road links. All these link types were appropriately recorded while coding the road network and preparing link list for basic network of study area. The widths of links are calculated based on these link types. The ID’s of link types are given in Table 2.1 While digitizing the road layer, node layer is developed automatically. Network attribute Table prepared in TransCAD is shown in Figure 2.4

Figure 2.2 Zonal Layer

Figure 2.3 Network Layer

Figure 2.4 Network Attribute Table
Table 2.1 Different Types of Links in the Network

3. Oversized Vehicle Routing Module
The objective of this module is to develop a procedure for routing of oversized vehicles by considering width of vehicle, type of road that is to be avoided and height as inputs and giving a graphical output depicting the path to be followed by the vehicle on the network. The main emphasis of this module is to provide a best route for an overweight and oversized vehicle in a heavily congested and fully constrained network like Greater Mumbai. The procedure automatically identifies all links on a specified route and evaluates the adequacy of the links for vertical and horizontal clearance requirements of a given vehicle. The process for finding feasible routes consists of:

The establishment of a tentative route with adequate width and height clearances.
Identification of all the bridges along the route for vertical clearance.
Check whether width constraint is satisfied or not.
Check for type of road.
Identification of an alternative route when at least one requirement is not satisfied.
Finally select the shortest path satisfying all requirements.

The procedure adopted for present module was clearly explained in Figure 3.1. The details link attribute table created in TransCAD was shown in Table 3.1.

Figure 3.1 Flow Chart of Oversized Vehicle Routing Module

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