12.1 Transportation planning notes

1. 12.1.1Urban road hierarchy, road cross-section elements, IRC design standards and traffic signs

   Urban roads are graded from expressways and arterials (mobility) down to collectors and local streets (access), and each class gets its own right of way, design speed and cross-section, set by IRC codes and, in Maharashtra, by the UDCPR road-width tables.

   Standard · 10 min · Read here
2. 12.1.2Traffic volume studies, counts and PCU values

   A traffic volume study counts how many vehicles, and of what type, pass a road section in a given time; the counts are converted to passenger car units (PCU) so that mixed Indian traffic can be compared with road capacity.

   Standard · 8 min · Full course
3. 12.1.3Origin–destination surveys: cordon lines, methods, desire lines and uses

   An origin–destination (O-D) survey finds where trips start and end, by what mode, for what purpose and at what time, inside a study area bounded by a cordon line; its results, shown as an O-D matrix and desire lines, are the base for planning roads, terminals and transit.

   Standard · 8 min · Full course
4. 12.1.4Parking studies, speed and delay studies and accident studies

   Parking studies measure how much parking is used, for how long and by how many vehicles; speed and delay studies show where and why traffic slows; accident studies find dangerous spots and their causes, so that each problem can be fixed with evidence.

   Standard · 9 min · Full course
5. 12.1.5Traffic flow theory: speed–flow–density, capacity and level of service

   Traffic flow theory links three measures, flow, density and speed, through q = k × v; from it come the ideas of maximum flow (capacity) and level of service, which tell planners how close a road is to breaking down.

   Standard · 7 min · Full course
6. 12.1.6Travel demand: four-stage model and modal split

   The four-stage model forecasts future travel in four steps: how many trips each zone makes (generation), where they go (distribution), by which mode (modal split) and on which route (assignment).

   Standard · 8 min · Full course
7. 12.1.7Intersections: conflict points, rotaries, signals and grade-separated interchanges

   An intersection is where streams of traffic meet and conflict; planners control those conflicts by separating them in space (islands, rotaries, interchanges) or in time (signals), choosing the type by traffic volume, land and cost.

   Standard · 8 min · Full course
8. 12.1.8Public transport and non-motorised transport: metro, BRT, RRTS and NUTP mode priority

   Cities move large numbers of people efficiently only through public transport (bus, BRT, metro, suburban and regional rail) supported by safe walking and cycling, which is why national policy puts walking, cycling and public transport ahead of private vehicles.

   Standard · 8 min · Full course
9. 12.1.9Transit-oriented development principles

   Transit-oriented development (TOD) concentrates dense, mixed-use, walkable growth within a short walk of mass transit stations, so that more people can live and work where they can reach transit on foot; Maharashtra applies it through UDCPR Regulation 14.2.

   Standard · 9 min · Full course
10. 12.1.10Railway and airport planning and transport financing: BOT variants and Hybrid Annuity Model

    Railways and airports shape land use around them and need protected land and height controls, which the UDCPR enforces through NOCs and buffer rules; large transport projects are funded through EPC contracts or PPP models such as BOT, HAM and TOT.

    Standard · 10 min · Full course

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