Add comments to profiles about uturn

profiles/car.lua

@@ -128,6 +128,8 @@ maxspeed_table = {
   ["uk:motorway"] = (70*1609)/1000
 }
 
+-- these need to be global because they are accesed externaly
+u_turn_penalty                  = 20
 traffic_signal_penalty          = 2
 use_turn_restrictions           = true
 
@@ -138,7 +140,6 @@ local turn_bias                 = 1.2
 
 local obey_oneway               = true
 local ignore_areas              = true
-u_turn_penalty                  = 20
 
 local abs = math.abs
 local min = math.min