Has anybody had any trouble with the FFRR and ferry standard height allowances? I'm going P&O Hull -Rotterdam and the online ticketing has a standard maximum height of 1.80m, not sure if this make difference but i have 22" factory fitted alloys no roof rails just standard fixed panoramic roof.

Can someone also explain if the car is in locked access height and i will go over speed limit would that rise the suspension automatically without any warning ?

All std tyres are the same height.

1.8 is close - the tunnel is 1.85 and mine only just fits under that in access mode, but I’ve not actually measured. There seems to be a good margin for error though - once under the barrier, there doesn’t seem to be anything below around 2m - the tunnel that is - not done the ferry

If you go too fast it starts bonging and displays a warning.

I use the Hull to Rotterdam crossing quite often, and have never had a problem with height in my FFRR with 22's. 2017 Range Rover SDV8 Vogue SE
2018 Audi RS6
2018 VW Amarok V6 255