experts suggest creating a buffer or service area around the designated stop of the public transport within a metre walking distance countries with more advanced systems of data collection may wish to conduct an entire network analysis within the same buffer but paying attention to the street network as part of a physical accessibility component they can also adapt to the transit system separating nonrapid transit the conventional bus from rapid transit the metro light rail bus rapid transit brtj etc at a metre walking distance experts also proposed to consider including formal and informal transport systems yet in many countries there is no clear way of defining stops for informal transport it is also suggested to disaggregate information to the greatest extent possible when reporting although this requires major efforts mainly surveys which are still lacking in most cities the share of population with access to public transport depends on several factors