I'll start with a bit of a background... At the few intermediate and advanced riding courses with HART and Stay Upright, one exercise that I was never comfortable with was the swerving. No problems with the actual action of swerving, but I was always nervous about the instructor standing in front of me, and pointing in a direction at the last moment. What if I get it wrong? What if by the time I realize what direction to swerve, it's too late, and I run the instructor over? (in fact, I almost did it once, missing the instructor by a few centimeters). These thoughts make me nervous, and I end up occasionally trying to "guess" which direction the instructor will point to, despite screaming at myself in my mind - "Don't guess, relax, pay attention..." With another advanced course booked with HART in August, I decided to test my reaction times on the computer, and see what my limits are. A quick search on the internet didn't result in anything that would satisfy my requirements. All tests that I could find were of type "See - Act", whereas I wanted something like "See - Decide - Act". So, I dedicated my lunchtime today to writing a little MS Excel spreadsheet that does what I need. Given that I am probably not the only guy with this problem, I thought I'd share it with you guys, even though the spreadsheet is quite rudimentary. Basically, the program works like this: press the "Start" button, and get ready, with your left hand over the "Esc" key, and right hand over the "Enter" key. In a few seconds (random duration - between 4 and 9 seconds) the text "Left" or "Right" appears in the top left corner. As soon as you see it, react - press "Esc" for left, or "Enter" for right. You'll get your stats of getting it right, and averages of your reaction times. Of course you can ignore the direction, and always press the Esc key to see your "clean" reaction times, without the decision making. For me, the "clean" reaction times are between 0.15 - 0.25 seconds. Adding the decision making, I get between 0.35 - 0.45 with 90% accuracy. Taking it easier, I get between 0.35 - 0.55 seconds with 100% accuracy. If we add maybe 0.3 seconds for pushing the handlebar or reaching / squeezing the brake lever, to be on the safe side I really need to be about 1 second away from the danger to be safe - assuming I expect the danger to happen in the next 10 seconds! Anyway, if you think you could use it - enjoy! Edit: Just uploaded an improved version, with a couple of changes: 1. If you try to guess and press Esc or Enter before the program tells you to do it, you'll get "Guess" as your result, and no time will be recorded; 2. The average time will show only the average of attempts where you got it right ("OK" attempts); 3. Fixed the formatting of reaction times to make more sense.