I have mentioned this before but topical here, a lorry sat-nav would have been very useful.
With a previous employer, I was having to do some deliveries in the 7.5 t to help out, it was one of the the very bad winters with a lot of snow. The country roads were basically ploughed to a single lane with snow banks on either side, not much of a problem as not many people were out. Anyway, turned off the main road, on to a narrow country road & after about a mile came to a longish single lane bridge, concrete slabs on pillars. I didn't like the look of it, so stopped & considered it. Decided not to cross as I was fully loaded (also it looked a bit too narrow for me), had to reverse back to the main road. That was when I noticed the 3 ton restriction sign which had been uprooted by the snow plough, and was half hidden in the snow bank. There was no other warning sign between the main road & the bridge, maybe it too had been uprooted.
Yes, I used my intelligence, but I am not a bridge engineer, so could have tried to cross it. A sat-nav would have at least warned me in advance.