For example ratio = 0.8 and current speed limit is 60 km/h - for
Russia: enforcement tolerance is 20 km/h for all speed limits => we
should start warning the user when current speed > 60 + 20 * 0.8 = 76
km/h - for Turkey: enforcement tolerance is 10 percent over the speed
limit => we should start warning the user when current speed > 60 +
60 * 0.1 * 0.8 = 64.8 km/h