People are just realising REASON why iconic red London buses have white roofs

London, United Kingdom is known for many iconic buildings and landmarks.

You can pretty much find a phone box on most streets and a pub on every corner.

And one thing which makes the capital so unique is its red buses.

So have you ever wondered why the roofs of the buses are white?

According to a Reddit user, they didn’t realise the revelation.

The user wrote: “London buses are white on top, how did I not know this?”

Naturally, people started sharing reasons why the roof might be a different colour.

Another person claimed it was to do with the identification code on the top of the bus.

The user said: “The black ID number probably doesn’t stand out enough on red, so it’s on white to be easily identifiable from a helicopter/CCTV.”

Although a Reddit user quickly debunked that theory as they wrote: “But, that doesn’t explain why the whole roof is white – they’d only need to paint the bit surrounding the ID numbers?”

But it turns out the reason is be more efficient.

It turns out the white-topped vehicles have been roaming around London since 2004.

The white roof reflects the sun, keeping the bus cool in the summer and preventing it from overheating.

It’s also more fuel efficient because buses don’t usually use air-con in the summer as it consumes oil.

And it essentially means the buses are more environmentally-friendly.

But it seems as though the white roofs aren’t just for summer.

Another Reddit user claimed: “Also since white is the slowest in emitting radiation, it helps to trap the heat during colder times, especially atop where all the warmer air naturally goes to.”