What is the most important rule of bike safety? It is wearing a properly fitted bicycle helmet. We are going to study how wearing a properly fitted helmet makes a difference. There are three pages for this activity. You will be asked to take pictures a few times. If the pictures will not fit in the provided space, you may add pages. To add pages, tap at the lower right corner of the screen. You may need a few days to finish this activity. Save your work by tapping each time you add to it. To add to your work, tap at the lower right corner of your post and select "Copy and Edit".