Bear in mind that if the helmet did its job most people would tell you that they did not even hit their head, or did not hit their head that hard. And the thin shells on most helmets now tend to hide any dents in the foam. But if you can see marks on the shell or measure any foam crush at all, replace the helmet

Is it OK to keep a bike outside? The bottom line: Leaving your bike outside for a day or two won't do major damage. You may see signs of rust after a week of neglect. After one month in bad conditions, your beloved bike parts will start to degrade.

When riding, always: Go With the Traffic Flow. Ride on the right in the same direction as other vehicles. ... Obey All Traffic Laws. A bicycle is a vehicle and you're a driver. ... Yield to Traffic When Appropriate. ... Be Predictable. ... Stay Alert at All Times. ... Look Before Turning. ... Watch for Parked Cars.