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You should add a PostGIS extension, and use the geometry type instead. It will handle 30000 features easily, and work with many GIS systems (e.g. QGIS). You can always extract the WKT equivalent from a geometry column using ST_AsText. Here's an example workflow, assuming it's a table in postgres --Say you have a table described in your question CREATE TEMP ...


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All of the things you mention will vary based on use of the data and choices made in the database schema. So the short answer is, it depends. Most maps wouldn't uniquely identify a particular road segment. Some might do it by cross streets (x between y and z) and other might do it by address ranges (the x hundred block of y). However the data behind the map ...


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From the Google Maps Maker Maker Help page: Lanes designate the number of vehicles that can pass parallel to one another on the route. Select the number of lanes to specify the total number of drivable lanes on the drawn road. Verify the number of lanes selected using satellite imagery and Street View where available. One-way Roads: Use the total ...



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