One way roads

[Сергей Федутов]

Hello!
 
I have roads database (created from shapefile) and need to draw one way
roads with direction marker. 
 
One way roads determine by special field, but direction bases on line data.
 
For example, i have line with three points (long, lat) {0.1, 51.1; 0.2,
51.1; 0.3, 51.1}. So, if line have onway flag - direction is from left to
right. If line data is {0.3, 51.1; 0.2, 51.1; 0.1, 51.1} direction is from
right to left.
 
How i can render these lines? 
 
I need something like ----->-----  or ----<-----.
 
Thanks.
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