Ya, my bro-law & sister from far east drove a rental car through it then got “fine” because they did not know where to pay. They were searching all over when they saw the signs. No toll booth … what a silly idea. (the rental company actually paid the amount for them so technically not a fine but there was a nasty reminder)
Ya, they tried to pay online the second time but couldn’t get through so I think they are just going to get the car rental company to pay for them instead.
Basically it’s incompetence. We are used to toll booth in the far east to pay for all usage of long distance highway … they just laughed at such incompetence in UK …