I was cleaning some pub carpets other day in local town, parked on a wide pedestrian area outside pub, placed hose under ramp, and placed cones over 4' of hoses.
While having a coffee and ciggie break with landlord outside, i noticed that only 1 in 5 would actualy walk over ramp. The rest tried to squeeze between cones, or walk 20 yards around van.
So much for keeping to H & S
Andrew