I would let them walk/cycle across the track, or get the bus.
As for getting wet etc we have a half hour walk to school across a field, yes its muddy so my kids have wellies and waterproof trousers. My 9yr old in yr 4 can walk to and from school on his won now, there is one busy road but it had a pedestrian crossing so he uses that.
I know a few parents are aghast that I let him walk on hs own, but its a route he has been doign since he was 2. He knows it well and I feel its safe.
Many parents are not letting their children do a shorter walk until the summer of year 6.
When thinking baout the risk my main concern was the road, abduction didnt feature on my risk assesment.
He was offered a lift by a parent one day as itwas rainjng, he told them no, the parent then called me to say could he have a lift and I then said yes. He knows not to accept a lift even from someone we know without checking with me first.
I make risk assesments all the time about my children, I am picky about car safety, much more so than somefriends who would not let their children walktos chool, but happily let them travel in just a basic booster seat etc, whereas I would use a high back carseat.
Ileave my sleeping toddler in the front garden in her pushchair and did when she was a baby, others ha e said dotn you worry someone will snatch her and no I dont, we live in a queit cul de sac, I can see out from my living rooma n kitchen windows if anyone did walk up to the front of the house iw would see them and be there in seconds. Ditto letting my children play in the cul de sac.