"The fourth power law (also known as the fourth power rule) states that the greater the axle load of a vehicle, the greater the stress on a road caused by the motor vehicle."

"The ratio of the car to bicycle is 160,000 to 1.

This means that after 160,000 crossings, the bicycle causes as much damage [to the road] as the car does when driving on the road only once." - en.wikipedia.org/wiki/Fourth_p…

Holy shit! #cycling #bike @cycling

On a way back from Beroun to Prague we had to took a #Kalštejn selfie

#traveling with @anna on #bike
🏰 🚲