Tbh I wouldn't want to do more than a ton on the A40, like farmer says the dynamics of the road change significantly above that speed, and the risk of other drivers pulling on to the road is too much of a risk IMO.
I have done about 150 on that stretch on a motorbike, and TBH by the time I got up to 150, I had to slam the brakes on to get back down to a safe speed before the dual carriageway onto Marlylebone Road.
Tbh I wouldn't want to do more than a ton on the A40, like farmer says the dynamics of the road change significantly above that speed, and the risk of other drivers pulling on to the road is too much of a risk IMO.
I have done about 150 on that stretch on a motorbike, and TBH by the time I got up to 150, I had to slam the brakes on to get back down to a safe speed before the dual carriageway onto Marlylebone Road.
No room or time for any sort of error.