This thread is pretty funny. They just time how long it takes you to cover the set distance between the cameras and works out the speed from that?
What happens on the ones with multiple cameras?
If you go through Camera 1 in lane 1.
Swap to lane 2
Go through camera 2
Swap to lane 1
Go through camera 3
Then you've evaded camera 2, but you'd still be timed from camera 1->3
Or does the fact you were in a different lane at camera 2 void the other stuff?
Are you really that desperate to sit at a few mph over the limit? Just stick to the limit in the roadworks section, it won't kill you!
its annoying, why take a 70mph motorway down to 50mph :\
I hate these. My car is pretty hard to keep at a constant speed, so you keep having to look at the speedo.
Not when there aren't any men there! Or if its the M4, when there aren't even any roadworks there!
Roadworks where men are working very close to the traffic. Plastic/rubber cones don't provide the protection of a brick wall so reducing the speed of the traffic is necessary, especially when lanes are narrower and less well defined.
qwerty said:Actually that gives an average speed of 48mph.
EDIT: I fyou wanted, you could go at 66.66mph for the first mile and 40mph for the second mile and average 50mph over the two miles.
Which wont work anyway because the cameras are not placed at just the beggining and exit, they are inbetween.
Don't forget that you're travelling at different rates.
For the 1st mile, you'd be travelling at 60mph. Therefore it takes you 1/60th of an hour to travel that distance ie 0.0166 (recurring) hours
The 2nd mile, you'd be travelling at 40mph, so it take you takes you longer - 1/40th of an hour to travel that distance ie 0.025 hours
Total distance is 2 miles which takes you 0.0416 (recurring) hours to travel that distance,
Therefore you're average speed over that distance is:-
2 miles / 0.0416 recurring = 48mph
Wrong, you've failed to take into consideration the time it takes to get from 60-40..which with the info given you cant calculate.
Just stick to 50, whats the point at travelling at 60 ' whatever and then dropping down to 40..pretty pointless.