HSR is much simpler to control due to its predictable course. High-speed rail systems reduce (but do not eliminate) collisions with automobiles or people, by using non-grade level track and eliminating grade-level crossings. To date, the only two deadly accidents involving a high-speed train on high-speed tracks in revenue service were the 1998 Eschede train disaster and the 2011 Wenzhou train collision (in which speed was not a factor).