This is The Dark Hedges in Ballymoney, Co.Antrim, Northern Ireland. Originally planted by the Stuart family as an impressive approach to their home, Gracehill House, the trees are now over two hundred years old.
The lane is said to be haunted by The Grey Lady who glides silently through the trees until she passes the last beech tree, whereupon she fades away.
It reminds me of the country lane that Kate is driving down after rushing from the church with the strange box she has found in the church (Blackfeather, Chapter One). Imagine travelling down here when a mysterious figure suddenly appears in front of your speeding car and unable to stop in time you drive straight through him.