The braking and handling of cars now compared to 1973 when I took my Drivers Ed simply do not compare. 2 seconds then makes 2 seconds now much safer.
Our teacher had us set in a chair in front of the class one at a time. He held a yardstick by the tips of his fingers with it dangling to the left of our right foot at one foot off the ground. He would let go and the challenge was to hit the stick before it hit the ground once he let it loose. No one could do this. He used this as an example of how long it takes to react.
Great teacher, when traveling at 70 on I-5 he always kept on us saying "keep it on the top side of 70". It was actually scary doing so in a 72 LTD boat of a car going thru the curves along Lake Samish.