When you go eastbound on 280 approaching Newark, if you stay on the highway, the highway abruptly ends and you end up on local streets in Newark.

To continue on 280, you need to take 2 exit lanes on the right, which takes you on a section of 280 which is suddenly 2 lanes in each direction without any shoulders.

That's because they never continued 280, they just connected it to a previous road, and renamed it 280.