Noita kun tutkii niin selviää aika paljon tästä aiheesta. 
http://www.roadandtrack.com/article....&page_number=1
http://www.roadandtrack.com/assets/d...read_carts.pdf
http://www.roadandtrack.com/assets/d...peedometer.pdf

http://www.roadandtrack.com/article....&page_number=1
http://www.roadandtrack.com/assets/d...read_carts.pdf
http://www.roadandtrack.com/assets/d...peedometer.pdf
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