>>1845388They do and it's why quad gates are required for speeds above 90 mph. Brightline operates at 90 around grade crossings, thereby skirting the rule.
In another context, this is why Caltrain has to rebuild all of their grade crossings for California's high-speed rail project as they want to increase speeds from 79 to 124. And I mention Caltrain specifically because the problem you described has been discussed so much, a billion times, a lot, with all miniscule retarded details thought about over on the Caltrain HSR compatibility blog whose owner did a site-by-site analysis of all Caltrain grade crossings. Which, in the context of your question, means quad gates and 90 second gate down time.
And again what you said exists. It's how California determines where grade sep money goes. It's how the 25th Av project in San Mateo and the Rosecrans/Marquardt project in Los Angeles. And it's why the entire Alameda Corridor exists. And it's why there's been over 15 years of discussion online about this topic.