# Energy Savings: Cycling vs. Driving

What energy savings could be achieved if an extra 1000 people cycled to the work each day, as opposed to driving?

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Problem:

What energy savings could be achieved if an extra 1000 people cycled to the work each day, as opposed to driving?

Solution:

According to the statistic data (see for example http://en.wikipedia.org/wiki/Fuel_efficiency_in_transportation), a cyclist riding at 16 km/h needs about 110 kJ/km. This is consistent to a consumed power of

( 1)

where consumed energy per kilometer of riding.

Remark: The useful power achieved by the rider is much smaller, considering the efficiency of the biomechanical energy conversion; if we estimate, for example:

then the useful power will be:

...

#### Solution Summary

The expert examines energy savings for cycling versus driving.