Two reasons.  Barrett Hill Road and Pixley Hill Road.  They are very steep,rough, NOT BLACKTOPPED, and are “Seasonal Use Roads”.  They are marked as such.  There is no Maintenance, i.e. PLOWING SANDING or SALTING.  Follow our directions and stay on the good blacktopped roads.  You don’t want to have problems on the way here.  Save yourself trouble and save your transmission, use our directions.