Considering Gibraltar has a grand total of 34,000 residents, it’s more similar to a rail crossing splitting Palo Alto. Which is the case. Similarly, probably as many people a day use the Fremont drawbridge in Seattle, which yields to boat traffic. I think this class of example is why people would be surprised so few cars would sometimes block air traffic.

Also the 101 has traffic lights in SF, when the freeway turns into Van Ness. If Van Ness had a rail crossing, I’d expect cars to wait on trains.

There's much more traffic than the residents. A lot of people work but doesn't live in Gibraltar, a lot of tourists and loads of people crossing the border just to buy cheap cigarettes. There are usually queues outside every cigarette shop. It's complete chaos at the border and nothing like any rail crossing I've ever seen.

Gibraltar has seen as many as 12M yearly tourists in its prepandemic peak https://en.wikipedia.org/wiki/Tourism_in_Gibraltar

For comparison, New York used to get 66M yearly tourists https://www.nytimes.com/2021/05/13/nyregion/nyc-tourism-covi...