Road side barriers are constructed to protect passengers and contain vehicles when a vehicle crashes into a barrier.In general.full-scale crash testing needs to be carried out if a geo metrically and structurally equivalent barrier has not preyiously been proven to meet the require ments of containing the vehicle and dissipating sufficient impact energy for passenger protection.As full-scale crash testing is very expensive.the number of data that can be measured in a test is usually limited.and it may not always be possible to obtain good quality measurements in such a test.a reliable and efficient numerical simulation of crash testing is therefore very useful.This paper presents finite element simulations of a 3-rail steel road traffic barrier under vehicle impact.The performance levels defined in Australlan Standards AS5100 Clause 10.5 for these barriers are checked.The numerical simulations show that the barrier is able to meet low performance levels.However.the maximum deceleration is higher than the acceptable limit for passenger protection.If present,a kerb launches the vehicles into the barrier,allowing for the possibility of overriding the barrier under certain circumstances.but it redirects the vehicle and reduces the incident angle,which reduces impacf force on the barrier.Further investigation into all common kerb profiles on roads should be carried out.as only one kerb profile is investigated in this study.