You'd think those concrete barriers would stop a vehicle, but the last few accidents I've seen, they almost act like ramps.
We have similar barriers here in Utah to keep oncoming traffic split, and the last few accidents (both trucks) have jumped those barriers and into oncoming traffic.
In fact, a local news station had an employee, his wife and all their dogs die when he lost control on a snowy overpass, jumped the barriers and crashed below. No one was wearing seatbelts.