Two siblings allegedly racing against each other in luxury cars, causing a multivehicle crash in Johor state that killed five people – including four members of a family – have once again put the spotlight on the “serious public health challenge” facing Malaysia’s roads.Police arrested a 19-year-old driver of a Mercedes-Benz, identified by local media as a Singapore university student, over Monday’s accident which occurred on a highway linking Kluang to Simpang Renggam in Johor.Police said a...