Now that I read your question carefully, I'd say that both are correct. They convey different meanings, though.

A lot of motorists got involved in fatal accidents last year, and a lot of them will get involved this year, too. (You're in beginning of the year in this case and you are "predicting" the future)

A lot of motorists got involved in fatal accidents last year, and a lot of them have gotten  involved this year, too. (Up to this day several other accidents have occured. You're describing a situation)