im also curious about this, ive noticed that on my copy of metroguide i get the oddest routes in and around halifax,NS... it always wants me to take the bedford highway (70km limit w/lights) as opposed to the 100 series that runs near it no matter if i choose faster or shorter distance (both of which the 100 series is). anyone in the HRM with a gpsmap 60c (or cs) that can shed some light ?