In Oslo, energy consumption has reduced dramatically since 'intelligent lighting' systems were installed in the late 2000s.
When a car - or a cyclist or pedestrian for that matter - passes a radar sensor attached to the street lights, the lights turn to a full 100 per cent, allowing people to have full sight of what's ahead of them.
After the car passes, the lights return to 20 per cent to save energy when they're not needed.
BFF mode uses the same swipe right or left platform as the apps dating mode and requires that a conversation is started within 24 hours of matching with a potential friend.
Conversations started with potential friends are color coded as green as opposed to yellow for dates.
Users have the option to immediately receive a new set of three backtracks by sharing Bumble on Facebook, Instagram, or Twitter, although they are limited to one of these refills per day.