The two women used the Touch n Go card system to enter Malaysia. They tried calling for a customs officer but did not manage to get a response. At the Malaysian immigration side of the Causeway, they drove into a lane that was not manned. 'There wasn't anyone at the station and the green light was on,' said Ms Lim. 'I pressed the intercom and couldn't hear anything because of the static, so I just continued driving when the barrier opened.' Ms Chang said they drove on because they thought that Malaysia's newly introduced biometric system - which has been in the news - would be ahead.