Motoring0 min ago
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Well they like to have a little chat and keep in touch with each other. Then they take it in turns to lead and get the brunt of the weather while those to the rear get honked at (no I'm not a cyclist, in the club sense). The wider the road means that the more abreast they can ride with the object being to make it impossible for vehicles to pass without crossing the central markings.
I get frustrated too. ;-)