Before revision: Typically such fares are set at least ten percent above the fare normally applying on that route or offered by alternative service; such fares might be levied at times where traffic-levels would otherwise be unbearably high.
After revision: Typically such fares are set at aroundanother route ten percent above the fare normally applying on that route or offered by alternative service; such fares might be levied at times where traffic-levels would otherwise be unbearably high.