There's some devious, anti-car skulduggery afoot in Wales - well, certainly in North Wales.
One example from a recent visit to Pwllheli...
Driving down a country lane - no street furniture and no speed limit posted, so national speed limit assumed. Assumption reinforced by satnav (stated 60 limit), though maps Google Maps hadn't been updated with the 20mph crap, so was treating that info with a healthy dose of scepticism. Anyway, wasn't going anywhere near 60 as it just wasn't suitable, especially as we were in the van.
Next news, arrived at a T-junction with a more major road and there were signs warning of average-speed cameras in both directions, but no speed limit posted for either direction. Once again, no street furniture and no repeater signs so assumed it was national speed limit (and this time the road was much more suitable for such a limit). After 5 minutes or so, glanced down at the satnav and it's showing 30 limit - WTF? A completely unsuitable limit for the style of road and, as I say, satnav not reporting speed limits consistently accurately.
What would you do in this situation? Supposedly average-speed measurement in progress and already been travelling at 50/55 for the past 5 minutes, and there was no other traffic around to judge whether the limit was 30, 60 or anything in-between. I decided to pull over into a lay-by and wait for 5 mins and then continued on at a completely unsuitable 30.
A couple of cars did catch me up and I was hoping they'd overtake, thus confirming the 30 limit was bollox, but there were double solid white lines for miles on end, so that didn't happen. They were probably cursing me and I was most definitely fuming at being placed at risk of getting a speeding ticket, despite being very careful, following all the rules and using all the evidence available to me in order to determine the prevailing speed limit.
How can it even be lawful to have average-speed traps on a road where there are no speed limits posted? Absolutely f'ing ridiculous.
Conclusion? Avoid the area like the plague coz the bastards are out to get you.
[rant over]