This is a Regularity Section. Mark a Timing Point at 21.500 miles.

Download the 'Times Table' from the link below. This gives you the cumulative times at the points on the route where you change to a different road colour. You need to work out the intermediate times and distances to enable you to plot the route.

I haven't told you what speed to average on each road colour, you should be able to work that out for yourself. I will tell you that you don't have to break any UK speed limits and the speeds are the same for the whole route card.

The exact location of each speed change is where the road colour changes at Street View. Street View does not always distinguish between yellows and whites, so the change then is where the 'give way' lines across the junction would be. N.B. the colours for determining the correct route are those shown at OS 1:50 000 level only.

If you go straight on at a cross roads over a higher class of road but stay on the same colour, this is NOT classed as a colour change for the purposes of this route card. E.g. at a YGGY junction, you continue at the Y speed throughout.

The cumulative times are displayed to the 100th of a second (always rounded down). This is accurate enough to enable you to work out the correct route. All the distances are measured to 0.001 miles and intermediate times calculated to 1000th of a second before adding together to give the cumulative times. The final total time is given to 1000th to allow you to plot TC2 accurately.

Times Table

CRO for instructions 1 - 25, then AR for instructions 26 - 50.

TC1 @ SH101 in GS 4174.

TC2 at end of last instruction.

The route should be plotted mostly using Autop(i)lot. You will need to switch AP off and plot manually on some sections, try to follow the centre line of the road as accurately as you can. If the road is not shown at Street View level, mark your route to follow the road as shown at OS level.

A time-consuming card which utilised the distance feature of AP. As the first half was CRO, this gave you chance to work out the 'average speeds' for each road colour before it got a bit tougher when it changed to AR. The speeds were 20 (w), 30 (y), 40 (o), 50 (r), 60 (g) and 70 (b). Unfortunately a mistake in instruction 40, which should have read 71m 11.43s, caused some head scratching around Coombe Abbey, PC17 was relocated as a result of this. There also turned out to be a second possible solution for the finish location. The original solution, ending on the A428 near Mount Pleasant, is the more accurate - the route along the yellow to the white leading to Little Lawford is actually 0.007 too short for instruction 49, giving around a second difference in the times. However I have allowed it, because it appears that route distances on AP can change by as much as 0.008 when you save your solution. Gavin pointed this out in his comment but I had already discovered it myself when setting card 12. Also 29 of you finished on the white rather than the red so I consider it fairest to allow both routes.