[OSM-newbies] Colour scheme on GARMIN device

[H.S.Rai]

Three roads shown in:

http://openstreetmap.org/?lat=30.894358&lon=75.868777&zoom=18&layers=B000FTF

( or its screen shot:
http://picasaweb.google.co.in/hardeep.rai/SOSM#5274339370957571714 )

are rendered on Garmin GPSmap 76CSx as:

http://picasaweb.google.co.in/hardeep.rai/SOSM#5274339387810035298

which looks strange. The important roads "trunk" and "primary" are
shown as thin blue lines while less important "tertiary" road is shown
in thick red.

The file is downloaded from:

http://downloads.cloudmade.com/asia/india

Is it something to do with tagging on OSM, or some setting by
cloudmade, or there is setting in GARMIN unit? If it is offtopic for
this, please give me pointer where I can find more help.

Also note, primary road is indicated as "Intl. Border"

-- 
H.S.Rai