Oh I was totally wrong, in Spain slopes for roads are usually in % of m(up)/100m(length) [1] so I misread it as 8m up for every 100m of length, still not sure w

Oh I was totally wrong, in Spain slopes for roads are usually in % of m(up)/100m(length) [1] so I misread it as 8m up for every 100m of length, still not sure why. Thanks for the correction :) [1] http://recursostic.educacion.es/gauss/web/materiales_didacticos/eso/actividades/geometria/trigonometria/pendiente_carretera/img/pendientes.gif http://recursostic.educacion.es/gauss/web/materiales_didacti...