I'm planning a ride (Strava route) in the Alps, and I know there are some tunnels in the area. Coincidentally by taking the old road I'm planning to avoid the ones I know about.
I'd like to have a decent amount of rear light showing when I enter the tunnel, but don't have enough battery to have it running all day (it's a 200 km ride). I'm also not likely to be able to find a safe place to pull over and turn on a rear light when I know there's a tunnel coming up. So in an ideal world I'd run my high-power rear light for any stage of the route that has tunnels (and I'm likely to be stopping reasonably often). The front isn't an issue as I can switch that while going along, but my (good Lezyne) rear light is in a fiddly place and has a fiddly switch requiring a long-press. I'll have a back-up on my helmet that I can easily press while going along but can't confirm that's on while riding.
Cue sheets from Strava and Google Maps don't mention tunnels, and so far I've been following the route in one window and examining it on OpenStreetMap in another. If I plan further rides while I'm out there, I'll only have a small screen to check, and some are subtle or hidden under place names. Is there a better way?