DR Laura funny that your photo should remind me of my scare on the treadmill today.
I began slowly so I could program my weight & also make sure my shoulder was going to be ok. I don't like to go too fast until the pain eases up. I was slowing pressing the up button when suddenly the speed went racing up. I began pressing the down button only to see the numbers go up. As it was speeding past 6.3 I pressed the emergency stop button. Fortunately I had been watching the speed and quickly began jogging without losing my step.
I got back on the treadmill and gingerly began moving the up button, except it refused to move and was stuck at 2.5. I got off and found a different treadmill to use, after reporting the problem, one I have avoided as the control buttons are higher up and difficult for me to reach with my shoulder problems. I like to change the speed & incline every once in awhile & couldn't really do so today. I didn't dare jog as in case I found it too difficult to slow down. I only went 2 3/4 miles today.
The entire time I was on the 2nd treadmill I kept watching for someone to check the 1st treadmill. On my way out I stopped and spoke to someone else and stressed the danger of what had happened. Had I not been capable of jogging, many people at the gym are not, I could have been seriously hurt. As I walked out two people were heading to the treadmill. It turns out I'm not the first person to report a problem.