I have to admit, going UNDER the Johnson bridge was an eye opener. It makes me nervous to think what's holding me up.
It's not uncommon in this area for bridges to be built with limited capacity and lifespan - and for usage to exceed it by a LOT. I knew a woman who was a diver for the crews building the new Woodrow Wilson Bridge - and she told me years ago if I'd seen what she'd seen, I'd never go over that bridge again (thankfully, THAT bridge is gone).
Admittedly, the bridge is somewhat scary, although after years I've totally gotten used to it. I'm still nervous as hell on some bridges, such as the Bay Bridge (which is weird, because I've WALKED across it several times) and the Del Memorial Bridge, but it's not a good reason to re-build it. I do think however that the Johnson bridge ought to be wider to accommodate four lanes of traffic - or at LEAST have a shoulder for emergency vehicles. It's unbelievable during emergencies trying to shift around to let ambulances past. When a car breaks down on the bridge, good luck getting a tow truck in there.
I just don't seen a good reason why Rte 4 should be squeezed down to two lanes until 235.