In most countries outside North America, vehicles have separate turn signals which are amber rather than red. In the USA (and probably Canada) this is not part of the standards and a flashing brake light is used as the turn signal in the majority of vehicles.
Technology Connections (a youtube channel) thinks this is unsafe as the ambiguity and lack of redundancy in the American standards exposes other drivers to higher risks:
There are studies linked below that demonstrate a tangible safety benefit of amber turn signals. You might want to check them out. Though it might be small, the benefit is demonstrably there.
While I'm convinced (and not just because I'm a European) the video doesn't quote any numbers (though he suggests that safety data from US insurance claims should be able to measure the difference between the alternatives systems as some US cars follow the European standard).
The logic of the argument is convincing, but is the statistical evidence that European brake light standards are safer than American ones convincing?