The crash site sits along a bustling corridor for traffic heading onto the highway or deeper into Napa, with a gas station to the north and a park-and-ride to the south. The offramp, lined with scattered trees and plants, was shut down until noon as investigators worked to determine how fast the sedan was traveling before impact.

Two children are dead following a car crash with a driver suspected to be under the influence in Napa. The children's mother was arrested for driving under the influence of substances, according to authorities.