well, it´s true. It´s 20º inclined, while normal for brazilian standarts (in public parking places, but I guess if YOU want you can make it different) is something like 9º.
however, 20º inclined ramps are probably not unheard off... and even a 20º inclined STREET in New Zealand!!
Check this street
http://www.mdig.com.br/index.php?itemid=24297