I like to keep my eye on the road, so I use a sonar-type technique. Tossing an empty beer can or two out the window usually will give you a good “ping”.
24 posted on 06/07/2012 1:59:28 PM PDT by USMCPOP
(Father of LCpl. Karl Linn, KIA 1/26/2005 Al Haqlaniyah, Iraq)