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This page introduces an autonomous car development project where a map database supports the car navigation. Digital maps consist of the graph of streets and traffic tables which regulate cars on the roads. The 'CarNav' system send an alerts to the car control software that a table is coming. Map layers are stored in Postgres relational database management system with Postgis extension which serves many spatial functions, such compute the nearest street of the moving car and the nearest tables within a buffer zone. The 'CarNav' system was writen in C# language and the tool of map display is the SharpMap library.