It would be very difficult to draw the arrow in the middle of the road in the
same mapset. For my Benelux map, I draw the oneway arrows on the side of the
street.
There is a way to draw them on top, but then you have to use the line types
like 0x01, 0x02 which seem to get a higher draw priority. I use them for
bicycle=no and cycling routes respectively. But be careful with this, because
they are routable lines. I noticed the routing via address search will break if
you don't use road_class and road_speed; also if you want to make the labels of
those lines invisible, street name labels disappear permanently on some GPS
units and only come back by hard resetting the unit.
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