There's always 'help' at hand, immigration staff to guide you just before hitting the auto clearance machine with and obligatory stamp after. Double take, but the bottom line is you beat the crowds and long Qs (peak arrivals) -with special sinkies lane. The irony on my last do, there was hardly any long Q in regular lanes and I chanced on a new lane opened by a immigration officer -beating the crony at the sinkie lane:p