Why do headlights even have an off mode?
The amount of cars driving around at night with no taillights on is inexcusable, for how simple of a problem it is to solve.
Have you seen how hard it is to change a modern car's headlight bulb? I don't want to burn out a bulb driving around during the daytime and then have to pull the crankhaft out through the passenger seat to replace it because some engineer is an idiot.
Daytime running lights should include the taillights though, and be LED, and if you can't replace them within an hour the entire design staff should be rendered down for lamp oil.