Blonde Girl Strips Her Short Jeans Near The Yamaha All-terrain Vehicle

While quad bike safety has mainly focussed on users operating the machines correctly, the fundamental design has not been a public focus of the industry despite the high potential for rollovers and deaths which are frequently reported in media around the world.
Emissions
ATVs accounted for 58% of the SI (spark ignited) recreational vehicles in the US in the year 2000. That year, recreational SI vehicles produced 0.16% of NOx, 8% of HC, 5% of CO and .8% of PM emissions for all vehicles, both highway and nonroad. As a point of comparison, the nonroad SI < 19 kW (~25 hp) category (small spark ignition engines such as lawnmowers) comprised 20% of HC and 23% of CO total emissions. While recreational SI vehicles produce an aggregate of <4% of all HC emissions in the US, based on the relatively small population of ATVs (<1.2M) and small annual usage (<350 hrs), EPA emission regulations now include such engines, starting with the model year 2006. Engines meeting these standards now produce only 3% of the HC emissions that previously unregulated engines did.