The concrete barriers will run 6 miles in each direction, measure 56 inches tall and be more round and fortified with more rebar steel to deflect out-of-control vehicles.
In April, a big rig crash that involved two FedEx semi-trucks and a car ended up on the Metro tracks in Pasadena, resulting in the closure of lanes and Gold Line.
The current barriers are 32 inches high and old-generation K-Rails.
Metro approved the design of the new barriers last week. The new barriers will cost more than $11 million.
There is no timeline for when construction will begin.