I believe the term that may apply is "crazy"

Darla Renee Jackson, 25, who has 4 restraining orders against her that cited hundreds of threatening phone calls and text messages, pleaded not guilty today to a murder charge and faces 15 years to life in prison for ramming the motorcycle from behind, pushing him 300 feet and then running over the 39-year-old rider, identified by friends as Zachary Buob, after he kicked her car.

Jackson was heading north on Interstate 5 in Chula Vista when she got angry with a man riding a red Ducati motorcycle near her Nissan Altima about 5:30 p.m. Thursday, according to the California Highway Patrol.

The rolling altercation continued as the two passed through National City and merged onto eastbound State Route 54, CHP public affairs Officer Jake Sanchez said.

http://fox5sandiego.com/2015/06/02/1m-bail-set-for-woman-accused-of-running-down-motorcyclist/

http://abcnews.go.com/US/woman-charged-murder-us-navy-sailors-traffic-death/story?id=31490394