all of the wipeouts/wrecks i've had on an MTB have probably contributed to the fact that i've never crashed on a road bike in 20 years of riding. the more comfortable you are with tossing your bike around, riding wheelies, bunnyhopping, etc., the better your chances of preventing a mistake from escalating into a crash or avoiding danger. i'm sure the bmx days were also a huge help.
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"When once you have tasted flight, you will forever walk the earth with your eyes turned skyward, for there you have been, and there you will always long to return." - Leonardo daVinci