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 urine test came back negative for drugs.The suspect’s brother, a 22-year-old BMW driver, also died in the collision that left several others injured, including two children.The crash touched a nerve in Malaysia, where fatal road accidents and viral cases of reckless driving involving youngsters in luxury cars regularly fuel public anger over weak enforcement.Malaysia’s transport ministry has previously said road crashes kill an average of 18 people a day, describing them as a “serious public health challenge”.