There are various efforts to put that sort of data into OpenStreetMap.
Using OSM brings all the problems of redundant effort and crowd sourcing in, but it solves the 'in one place' part of the problem.
There's also the issue that OSM focuses on the geo side of the data, so it is usually pretty awkward to encode complex data (like multiple parking regulations or traffic signal plans)
Using OSM brings all the problems of redundant effort and crowd sourcing in, but it solves the 'in one place' part of the problem.
There's also the issue that OSM focuses on the geo side of the data, so it is usually pretty awkward to encode complex data (like multiple parking regulations or traffic signal plans)