Vegetation.

It's that time of year when the trees and hedges are growing at their fastest.

However, I did report this lot to the highway authority, Leicestershire County Council in this case, as they have grown into the cycle lane, which forces you out into the carriageway on an uphill left hand bend and this  feels quite uncomfortable given the disparity in speed between you and the traffic. The willows are even denser further down from this photo but it wasn't safe to stop and snap pics.

They have an online reporting system and it works very well. Things seem to get dealt with fairly quickly, which is good.