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You aren't allowed to ride the same stretch of road twice in the same direction, i.e. you can't do laps.
Not strictly true (about the same stretch of ride twice in the same direction). That rule (I don't think it's even a written down rule) was put in place to stop people coming up with rides which were just laps of a certain route (be it endless 1km loops, 20 x 10km laps of Richmond Park or a 200km ride made up of 4 laps of a favourite 50km training route).
There's nothing to say you can't use the same stretch of road twice in the same direction (many calendar rides do it[1]), but you'll be told that any route which is obvious laps of some sort is not allowed.
A simple 100km out and 100km back along the same A road is perfectly fine, it's going to be a fuckload easier to do it as DIY by GPS for the reasons previous posted. A start point, midway point (50km), turning point (100km) midway-back point (150km), finish point (200km). The midway points and the start/finish points can be the same place (my DIY up to Cambridge uses a cashpoint by Putney Railway Station, a garage in Broxbourne and the Tesco on Newmarket Road in Cambridge, then the same garage and cashpoint on the way back).
- The road to Kings YH for example.
- The road to Kings YH for example.
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Greenbank
hippy
If you are doing DIY by GPS then you'll need to set control points about 80km apart at the most. You can just nominate some point in the road and, as long as you ride through it or reasonably near it (within about 100 meters on your tracklog) you'll be fine. Yes, an out and back on an A road will be just fine for that.
You aren't allowed to ride the same stretch of road twice in the same direction, i.e. you can't do laps.
You'd be well advised to nominate major junctions as a control point in case for any reason you need to divert, you'll still be able to make the control.