[warning]
warn_distances=130:450,110:350,90:300,60:200,40:100 ;110:1000,80:800,60:500,40:300 <<these are the presumed defaults
speedcam_max_lookahead=1200 ;(1000)
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The first number of each set divided by a comma is Vehicle Speed (shown currently as KPH), the second number after the colon is warning distance in meters (or Yards, if your regional settings are set to Miles/Yards). You can adjust either number(s) to your liking or driving style.
Max lookahead is the distance (again, in meters or yards) at which the speedcam icon appears on the map. 1000 is the default.