The trucker did nothing wrong and Biden's wife was not paying attention,
Crash occurred at an intersection but article does not say who had the
ROW.

http://www.delawaregrapevine.com/12-07bidencrash.asp

(snip)

“I got elected when I was 29, and I got elected November the 7th. And on
December 18 of that year, my wife and three kids were Christmas shopping
for a Christmas tree. A tractor-trailer, a guy who allegedly – and I
never pursued it – drank his lunch instead of eating his lunch,
broadsided my family and killed my wife instantly, and killed my daughter
instantly, and hospitalized my two sons, with what were thought to be at
the time permanent, fundamental injuries.”

Except there was no drinking. There was not even speeding. The truck’s
brakes checked out, as well. It was not the driver’s fault.

(snip)

The state police investigated the accident. The concern then was not that
Dunn would get away with anything as serious as drunken driving, but that
he could get railroaded. He had plowed into the family of a United States
senator, after all.

As the chief deputy attorney general, Jerome Herlihy was assigned to the
incident. Two days later, he issued his report, clearing Dunn.

A story headlined, “No Charges Due for Trucker in Biden Deaths,” in the
Evening Journal read: “[Herlihy] said there was no evidence that [Dunn]
was speeding, drinking or driving a truck with faulty brakes. In
addition, Herlihy said, witnesses to the crash near Hockessin provided no
basis for a prosecution.”

No further details were released, although Herlihy knew more about the
accident than he let on. Years later, he elaborated.

In that interview, Herlihy said Neilia Biden either accelerated or
drifted through the intersection, and Dunn could not stop. The truck
driver said she was not looking at him, her face turned away, and the
state police thought she was distracted by one of the children in the
back seat.