At the same time, how many of those wrecks were as a result of blocking? I think that is more a result of plate racing. For the most part, everyone on the track is pretty equal. What can be done about it?
Exactly right. The problem isn't the yellow line - it's artificially restricting the speeds and, again artificially, bunching the cars up because passing is so restricted (pun intended).
And we know the solution, as impractical and prohibitively expensive (though certainly possible) as it would be. REDUCE the banking at Dega and Daytona so the drivers would be forced to actually drive the cars - and actually pass with them again. Those tracks were fine in the 60's, but have been obsolete for decades.
Of course, imagine the outcry from the hillbillies who flock to those 2 tracks professing to love the `great racing' there so much.
Restrictor plates are just dumb, dumb, dumb. Remember the horrible plate race at NHIS (now NHMS) with the thinking that that was the only way to prevent driver fatalities there? One of the worst races in Nascar history.
Only thing worse now are the Daytona and Dega races where `fans' merely wait for big crashes to occur.