NORTH HOLLYWOOD - A gunman in a white sedan who wounded a woman in a car-to-car shooting on the Hollywood (170) Freeway in North Hollywood was at large today.

A motive for the shooting in southbound lanes between Roscoe Boulevard and Sherman Way about 7:10 p.m. Friday was unknown, police said.

The 20-something woman who was wounded was driving a white Nissan Sentra, with her boyfriend, father and infant child in the car, when a white, newer-model four-door, with tinted windows, pulled alongside and a gunman in the back seat opened fire with a semiautomatic pistol, wounding her in the neck, according to police and broadcast reports.

No one else was wounded, but several bullets hit the car. One grazed the child's safety seat. Television stations showed a gouge in the seat's handle and bullet holes in the Nissan.

The wounded woman was celebrating her birthday, according to KCAL9.

The Nissan had entered the southbound 134 at Roscoe Boulevard and was headed south when the shooting happened near Sherman Way, according to police.

In the wake of the shooting, the Nissan veered into a curb, flattening a tire, and the woman exited the freeway at Sherman Way. She then got back on the freeway headed north, toward a hospital, but came to stop because of the flat, police said. The woman was taken to a hospital to be treated.