The best change I've seen in NASCAR since I started attending races in 1964?
Response time of safety & medical personnel to an accident scene.
I was amazed to see how quickly the crews were on top of the Danica Patrick incident following her horrible crash in the Daytona Duels.
Lots of changes have led to this quick response and I didn't at the time like many of the changes, but the results so far as driver safety are obvious.
Years ago, the safety vehicles weren't allowed to even roll until not only the cars had raced back to the flag under caution, but until the cars had slowed sufficiently in NASCAR's opinion to safely dispatch the safety crews.
Remember when we'd cringe waiting for a fire extinguisher to get to an accident site when a car was burning, yet in open wheel racing the safety team was there sometimes before the car stopped rolling?
It has been a change for the better.
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"Any Day is Good for Stock Car Racing"
updated by @dave-fulton: 12/05/16 04:02:07PM