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You could have a look at the INSPIRE data specification for transport networks in Europe. It is not a very appealing document, but it may give some insight. Chapter 5.3, see especially the enumerations and code lists in Chapter 11 describes some styles based on these classifications


You could use CASE statements (essentially an IF THEN ELSE statement) to determine the speed limit by road type. First either select to Create a new field (and determine whether you want integer, string etc. I will assume string) or Update an existing field and use an expression similar to the following: CASE WHEN "road_type" = 'lane' THEN '35 mph' WHEN ...

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