WHAT IS IT?

It's summertime vintage auto races at Road America in Elkhart Lake, Wisconsin USA.  It's the WeatherTech International Challenge featuring vintage auto racing.
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For you Brit Car motorheads out there in Blipville, this is a Triumph TR250K.  Initially, I thought the "K" designation indicated it was an aftermarket Kit Car. But a quick Google search disabused me of that notion.  Not true Kemo Sabe......read all about it here:
http://www.britishracecar.com/BillHart-Triumph-TR250K.htm
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Best in Large.