(AREA) -- Preliminary reports indicate two people died in crashes over the Christmas holiday and two people died in crashes over the New Year's holiday in Michigan, according to the Michigan State Police Criminal Justice Information Center. Alcohol is not believed to be a factor in any of the crashes. One of the fatalities was a pedestrian. The Christmas holiday period began at 6 p.m. December 24 and went through midnight December 25. The New Year's holiday period began at 6 p.m. December 31 and went through midnight January 1. In 2012, nine people died in traffic crashes during the four-day Christmas holiday, and 15 people died in traffic crashes during the four-day New Year's holiday. The holiday periods in 2012 were longer than 2013 due to the day of the week where the holidays fell. The holiday periods are determined by the National Safety Council.