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This method allows you to read speed for all links from a single DAT or DBF file.


Specify the full filename, including path.

Fieldindex is 0-based.

If fieldname is defined, fieldindex is ignored.

if mph=true, all speeds are assumed to be in mph and multiplied by 1.609 when read from the file.


If speed is 0 or negative for any link, it is ignored.


Syntax: ReadSpeed(index: integer; filename: string; fieldindex: integer; fieldname: string; mph: boolean);