These sort of lines always represent the 'forks', in this case a given timespan during which the target shold be reached, in other cases maybe a target range as opposed to time. After all the lines are nothing more than connections between several points on an XY graph
I will start to link the relevant posts in the future but I'm to lazy right now to look the last one up, search for it - I just try to visualize the farmer's hints given to the public but I try to include as little interpretation as possible, although the chart can not be be free of these.
The space between the lines could for instance be viewed as the prognosted trading range, but I leave it up to you to do such. Personally I rather see the 'targets' as key levels instead and watch the reactions at the time they are reached. I don't care so much about Raodmap for the time inbetween - except when things are heading south of course <g>
Hope this helps...
Andreas