I believe I may have been flashed by a forward facing traffic camera doing between 35-40mph today in an area, which I then found to be 30mph. The route is the A62 AKA Manchester Road in Oldham. I travelled approx 1.5 miles heading north/east bound from the junction with the M60. If I remember correctly, the camera is situated around Cambridge Street, around 1 mile from the junction of the M60. Over this 1-mile stretch, I do not recall seeing a single speed limit sign (I re-drove the route to check). The road is laid out with two lanes travelling each way with a grass divide between each pair of lanes. There is a mixture of homes and open area over the route so it is unclear (in my opinion) as to the classification of the road. Are you aware of any fixed requirements for distances for speed limit signs?