I think we get thought when going for a licence test to put handbrake on and leave in gear or park when stopped but could be different where you got yours...but it's common sense to me
On the cost side, if this added an extra 5 minutes to each of their trips it would add a substantial cost of running the barge. Remember its only a30min whole trip which includes boarding, etc. around 17% if my maths is correct. Now compared to the Herald which has roughly a 3hr + trip on water and probably the same boarding I think an extra few minutes to close the door would not equate to any major cost increase.
Also there were few other major contributing factors to the Harolds sinking going by your link. Main one was the ship was not designed for this particular trip..
The Fraser barge can go across with the door open.
Anyway, all good
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