Problem drawing lines

[Chip Taylor]

I have a map file that is supposed to draw streets from a shapefile.  Of
course, the shape file has many segments per street.  Mapserver 4.6 renders
the streets with gaps in the continuity of the line.  The same shapefile
displayed in ArcMap shows no gaps.  Can you tell me what is the problem?
Here is the mapfile:

# This is the Washington State map file
NAME "wamap"
UNITS DD
EXTENT -127.00 43.00 -115.00 50.00
SIZE 475 475
IMAGECOLOR 189 202 222
IMAGETYPE GIF

SHAPEPATH "../Shape_Files"
FONTSET "../fontset.txt"

##################################### 
# Symbol for drawing cartolines
#
SYMBOL
     NAME "cartoline"
     TYPE cartoline
     LINECAP butt
     LINEJOIN miter
     LINEJOINMAXSIZE 1
   END

##################################### 
# Web object
#
WEB
     TEMPLATE "../HTML_Files/sitemap.html"
    
     IMAGEPATH 'd:/wwwroot/tmp/'
     IMAGEURL "/tmp/"
END

##################################### 
# Washington State Road layer -  Local Roads (test)
#
LAYER
     NAME "testRoads"
     DATA "US_States/Washington/Roads/CountyRoads"
     status default
     TYPE line	 
	 CLASS
       NAME "Interstate Hwy"
	   STYLE
         SYMBOL "cartoline"
         SIZE 3
         COLOR 241 151 91
        END
     END
END

END # mapfile