Can someone explain how this unique format will work? Are there 2 purses/payouts for each race? How are they going to line up the field in each race? What is the point format (points for each race as if they were separate events)? Why not run 50 straight laps?

“SPLIT-50” MIDGET RACE AT IOWA SPEEDWAY FRIDAY
This Friday’s Mopar USAC National Midget race at Iowa Speedway in Newton, Iowa offers a somewhat unique format, with a pair of 25-lap segments comprising the 50-lap feature event on the 7/8-mile paved oval. The two segments will precede the 100-mile Traxxas USAC Silver Crown race which is also part of the “Casey’s General Stores USAC Triple Crown” presented by Pioneer Hi-Bred First Class credit Union and Boyer Petroleum.

http://www.usacracing.com/midget_index/news_m/4662.html