Chennai/Bus Route mapping project/OSM Mapping

Getting involved

map the bus stops in your area and add it to the bus stop list (see below)
if you travel on a particular route often, map the bus stops that you know
check the exiting bus stops in areas that you are familiar with
if you have good knowled of the mtc network, help in properly classifying the roads and extending the bus network road (mainly outside the city limits)

Chennai Corporation - List of bus route roads Most of these roads within city limits have already been mapped.
Wikimapia quite a few bus stops are marked on wikimapia. just move to a particular area and search for the keywords 'bus', 'mtc', 'stop' and 'stand'. this could help in locating bus roads

The bus route roads in Chennai are presently tagged according to frequency of buses:

highway=motorway for high speed highways/expressways with median. These roads are usually serviced by intercity buses
highway=trunk for arterial roads with median carrying majority of city traffic like Inner Ring Road, Anna Salai. These roads are major bus corridors
highway=primary for main roads with very high bus frequency <10min
highway=secondary for other roads served by public transport buse but with lower bus frequency >10min
Any other road that is not served by public transport must be tagged with the other tags, see Chennai#Roads

List of Chennai city bus stops obtained from Chennai Corporation
Map of chennai corporations zones and wards to help in locating the bus stops from the above list
Wikimapia quite a few bus stops are marked on wikimapia. just move to a particular area and search for the keywords 'bus', 'mtc', 'stop' and 'stand'. IMPORTANT use wikimapia only as a reference and not a primary source of information to copy from. Make sure you have first of knowledge and can guarantee the validity of the data you map into OSM.
MTC Bus Routesand rab.in to identify terminuses
Wikipedia list of important MTC route for main bus terminuses and to prioritize route mapping

Bus terminuses or bus stands are where a route originates or terminates. Is bigger than a bus stop and has space for temporary parking of buses