Amber Waves of Pain

Front turn signals invisible because too close to headlamps has been a problem for a long time. The minimum intensity requirement is 2.5× higher for turn signals within 4 inches of a low beam (or fog lamp, or DRL) than it is for further-away turn signals, but obviously this doesn't address the problem well enough.

That's on the list of old f*ckups in the North American lighting regs. Others: red rear turn signals that look just like (or often are) brake lights (rest-of-world regs require amber rear signals). Also, side-on visibility of the turn signal is not required here (other countries require side turn signal repeaters—allowed here but not required).