I have no personal experience with the stretch of road in question. But I can tell you here in Contra Costa County, Northern California, there are a series of tunnels that go through the hills that separate Berkeley and Oakland from Contra Costa County. Highway 24 and there are 3 tunnels that let out onto estraight road and the road after the tunnels is straight and in good condition and not a day goes by when there is not a serious accident on the highway leading out of those tunnels. And it’s the damndest thing, it’s just a straight road, you stay in your lane you have no issues. But every single day there is a traffic accident in that area. I have no explanation.... except that there are a lot of people driving these days who have no business whatsoever driving a car. They are either texting when they come out of that tunnel and get tweaked by the change in lighting, or they are simply idiots. Or both.
If you’re talking about the Caldecott tunnels, they actually added a fourth bore a few years ago, so the excuse of four lanes funneling down to two, depending on time of day, cannot be used anymore.
The Caldecott Tunnel (4 bores) has a drop (I understand) of 100 feet in elevation between the east and west portals. Going eastbound you emerge into a basically straight road. Going westbound you emerge into a series of banked curves and don't get back to the straightaway until you pass the Telegraph Avenue exit. A driver MUST pay attention on what is essentially a mountain road. There are always those jokers who are fixated on that little screen and that causes a world of problems for everyone else.