Hydrogen on road is simply not viable due to risk and it will never get up for a route to the port. Pipeline and rail are the only viable alternates. The pipeline will be huge cost and land works and rail less so. I think rail is the way to go to test the way forward and with less capital costs.
..........and yet you drive past equivalent bombs of LPG and petrol every day if one wants to discuss current accepted risk.
Hydrogen is also transported to the Valley now, in relative small quantities for generator cooling medium. So the difference is the volume, not that it does not already happen. Most would not even be aware.
A current issue in the Valley is transport of asbestos by truck, the carry on of the public is equivalent to as if it were nuclear waste. Asbestos transport is very much at the small end of the scale when it comes to risk to people. Yet highly emotive through ignorance more than anything.
Then there are other substance that travel by truck - caustic, oxygen, acetylene, acid etc. All kinds of wonderfull nasty substances every day. Most are blisfully unaware.