There doesn't seem to be any information associating the two lines drawn on both sides of a single lane line. There have been discussions on other repos about this issue but I can't seem to find anything useful (for example cardwing/Codes-for-Lane-Detection#273)

I have drawn the lane lines on the following image but the only info that would have identified the pairs is the id field, but you can see here (in blue) that the ids do not match for pairs. In the below image lines 0 and 1 should not be pared, but all the others should 4-5, 6-7, 8-9 (taken from b1ceb32e-51852abe.jpg). Is there any information about how to make a single lane line for each line instead of two? Once the pairs are identified then it should be easy enough to average, but it's not clear how to generate the pairs.