Almost all accidents are caused by human error… if you are drunk you are more likely to make a human error.
However, good traffic engineering mitigates the results of human error by designing roadways and traffic systems that enhance safety, reduce the likelihood of accidents, and minimize the consequences of mistakes.
By proactively addressing the potential for human error, traffic engineering saves lives and enhances overall system efficiency.
If the bend was better designed and engineered then fewer people would make errors and the results of those errors would be less severe.