Uedama is rather hot at the moment, it seems some particularly virulent gankers have returned to the game, that explains the several quiet days before today.
I would suggest that players who do not wish to feed this voracious ganker with easy kills do not accept short time courier contracts and ones that require full cargo holds if it requires passing through Uedama. In terms of moving your own stuff I would advise dropping your items off at stations before Uedama and taking them through in small chunks in difficult to kill ships.
They are in numbers above 40, so it is possible that they can negate the 15 minute criminal timer by logging in alts and using those that have not been in on the gank and closing that window to get through.
Of course there will be many people who just go through regardless. But for those of you who are a bit better than that, fly frosty o7
PS Just noticed that Destiny gave similar excellent advice in another thread