I had a similar problem in the UK a few years back. Major roadworks on the M1 / M62 junction at Leeds. The road was restricted to 50mph for the length of the road works, but there was no de-restriction sign at the end of the works in either direction. I drove this road every day and knew there were no signs. So - I sped up when the cones ended. And then, one day, got pinged a mile or so later for breaking the temporary speed limit.
Decided the fight the ticket in court, and came armed with a video tape. The previous day, I'd gone out with a video camera and driven from said junction back to where I lived in Manchester (about 100kms). The video clearly showed there was no de-restriction sign at any point along the route.
The magistrates, much to the annoyance of the police prosecutor, agreed that in the absence of any de-restriction sign (and I had to show that I drove the road every day and knew there was no such sign) the temporary speed limit could only apply to the area in which there was work going on. Essentially, it then fell on the driver to use his common sense. The charge was thrown out, and I got my costs refunded plus compensation for a day off work.
I'm sure the same would apply here, but you'd have to prove that a) you drove the road regularly enough to know there was no such de-restriction sign, and b) you only sped up when there was no evidence of works; no cones, no new seal, etc.
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