Yesterday evening's ride home from work was a bit of a trial. Headwind the whole way again. It may be (very nearly) flat here, but flatness means nothing to get in the way of the wind, and headwinds are much worse than the odd hill. They're like an eternal uphill - you don't get to go down the other side.
On the way I came across this family on the way home from somewhere. They have three children. Dad was giving the youngest child on his own wheels a bit of help while Mum had the very youngest on a seat in front of her on her bike.
I've not idea how much of the 30 km from Groningen to Assen they were riding, but they felt safe because the cars were on the left of the trees.