Why the Sun on Buses and Trains Is Way Worse Than You Think

You picked the window seat. Smart move — great view, maybe some scenery, classic travel experience.

Forty minutes later you're peeling yourself off the glass and wondering if the bus driver has the heat on for some reason. He doesn't. That's just the sun doing what the sun does when there's a pane of glass between you and it — basically nothing to stop it.

Glass is not your friend here

Most people assume windows block the sun. They block some of it. Specifically, UV-B rays — the ones that cause sunburn — are mostly filtered out by standard glass. Good news on the skin cancer front.

The bad news: infrared radiation, which is the part that makes you feel like you're sitting next to an oven, passes straight through. And UV-A rays, which cause long-term skin damage without burning, also go right through standard glass like it isn't there.

So you won't burn. You'll just be hot, squinty, and inexplicably grumpy for the rest of the journey while the person across the aisle reads their book in perfect comfort.

It gets dramatically worse in summer

In summer the sun is higher and stronger. On a midday journey heading roughly east or west, one side of the vehicle gets nearly constant direct sun the entire trip. The other side is fine. Not "a bit cooler" — genuinely fine.

The gap between the two sides on a clear July afternoon is not subtle. It's the difference between arriving fresh and arriving like you just did a light workout.

Your instincts are probably wrong

Most people pick seats by habit. "I always sit on the left." Or they grab whatever's closest to the door. Almost nobody thinks about where the sun will actually be during their specific trip.

The problem is that sun position is not obvious. It depends on: - Which direction you're traveling (a northbound and southbound train have completely opposite sun situations) - What time of day it is (morning sun is in the east, afternoon sun is in the west) - What season it is (the sun's path across the sky shifts a lot between January and July)

Getting all three right in your head while standing in a station? Genuinely difficult.

The fix takes five seconds

Type your route and departure time into SunRide. It tells you which side of the vehicle will be in shade for most of the journey, based on the actual road geometry and the exact sun position at your departure time.

It's not a guess. It uses the same astronomical math used to calculate satellite orbits and solar panel angles. A bit over-engineered for a bus seat decision, honestly — but it works.

Five seconds before you board. Makes a real difference on anything over 45 minutes.