A 4-year-old South Jersey boy was killed last night as he crossed a busy Burlington County highway with a teenaged relative, police said.

The boy, who was not identified by police, was crossing Route 130 in Burlington City at 5:13 p.m. when he stepped into the path of a pickup truck.

The Burlington City boy was pronounced dead soon after the accident.

Chief John Lazzarotti declined further comment this morning.

The driver, who stopped, has not been charged pending the investigation, he said.

The highway was recently named one of the most dangerous in the region for pedestrians by the Tri-State Transportation Campaign, a non-profit advocacy group. Nine people were killed on the Burlington County stretch of Route 130 between 2005 and 2007, according to federal statistics.