Free Online Reaction Time Test

Justpark.com, a parking space finding site,  has an app that will calculate your reaction time based on how quickly you notice the "Stop" notice on your keyboard and it takes less than a minute to complete.

Above is a screenshot of the test I took.   I am nowhere near 20, but have to admit I am a very cautious driver.   Some might call it being a "Granny" driver to drive a little under the speed limit give plenty of space between me and the car ahead of me, which has been pointed out allow someone to cut me off; I call it being a defensive driver with only PLPD insurance.