Types of collision include head-on, road departure, rear-end, side collisions, and rollovers. Untripped rollovers occur when cornering forces destabilize the vehicle. Lateral rollovers may also occur when traversing steep inclines. In the United States rollovers accounted for nearly 25% of passenger vehicle fatalities. This two-year rule applies to all distributions, including rollovers from the SIMPLE IRA. The same rules and restrictions apply to rollovers from plans to IRAs. All vehicles are susceptible to rollovers to various extents. The physics are similar to cornering rollovers. Jackpots began at $40,000,000 with minimum rollovers of $5,000,000. Some farmers were killed by rollovers while operating tractors along steep slopes. Their higher center of gravity increases their risk of rollovers. Its top-heavy design made it prone to rollovers. The Bronco II was dogged by reports that it was prone to rollovers. The starting jackpot increased to $20 million, with minimum rollovers of $5 million. Using rollovers they then funded longer and longer term obligations via the money markets.