A supply station does not sound like it needs great consideration -- the ambulances are perhaps not hot to go - just stocking up at the end of the shift. Is this a reasonable assessment?
I don't think there is much confusion about Davids Rd - it is clear why it has to be a one-way. The question is why the traffic is choked off at the top of Manor Mt and I don't see why it should be, any more than the other steep roads off of Honor oak Rd.
I feel it is a misuse of resources to actively enforce this, especially when police funding is supposedly being cut back.