Why Drive Nice?

It's high time to give Merferd fans the reason behind the "Drive Nice Merferd" ?
on tan abandoned bill board between Shreeve and Kingshighway on the North side of Westbound I-70

To you St Lou, It's now the time,
To tell the tale, to read the rhyme, 
Behind The "Drive Nice" Merf.
Especially since Phil and his daughter 
Got hit and run from a big semi,
And almost left this Earth.
-- Sound track by Aggie and Phil Berwick

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