The road there is stuck. Raising the railway, which has been done once already, is very expensive. Lowering the road would require moving a sewer main, which is a fairly delicate and also expensive job. Both railway and sewer are very old and substantially pre-date the modern assumption that you can just drive trucks wherever you want as if that's some basic element of civilisation rather than a weird temporary glitch.
Apparently there is a gravity-flow sewer underneath the road, making it very difficult to go any lower.
At some point it becomes cheaper to install a lift pump and a pressurized section for the sewage than to constantly have crashes to clean up and disrupt service.
That point is very far away as long as you can bill the costs of the cleanup/fixing to someone else (of their insurances).
The people that pay for new sewers (the utilities) are not the same people that pay for crashes and closures (driver's insurance companies).