The lines on a football field are coplanar parallel lines.
The National Football League or NFL uses conplanar parallel lines on all their fields.
http://www.google.com/imgres?q=coplanar+lines&start=29&num=10&um=1&hl=en&safe=active&tbo=d&biw=1280&bih=894&tbm=isch&tbnid=DtI5JdBBaMiOfM:&imgrefurl=http://parkerbass1geometry.blogspot.com/2012/10/three-or-more-coplanar-this-football.html&docid=NAF0f2Acnh6_fM&imgurl=https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhe_0l0Jgyo53WhIVDQmX8SzKVK-3LLhIEufXAPGYpLqh0WH2_5FXaLpGuBe5D5NnTuSoIC0hEtNVyfkd2rID9J9vVw8vOsKdsK2fRwG_oSF9bwk-wYio0kGKrnzuo3vlC2o-lnX47xfVo/s1600/lunapic_135060087082622_7.gif&w=480&h=360&ei=Qn2iUMm6MujW0QH1roHIBw&zoom=1&iact=hc&vpx=450&vpy=263&dur=704&hovh=194&hovw=259&tx=146&ty=105&sig=112621608789265777111&page=2&tbnh=133&tbnw=170&ndsp=34&ved=1t:429,r:23,s:20,i:73
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