Rule 9: Yelling
As I said above, yelling is a big no-no. You don't see the pros riding around Europe on their preseason training camps yelling at each other when they come upon a car, hole, gravel, or red light.
The problem is this: When you're more than two riders behind the person yelling, all you can actually hear is a general sound being yelled. So while everyone should be keeping their eyes peeled for general speed changes and obstacles, suddenly the majority of riders are looking around wondering what the obstacle is that has just been yelled out.
No one actually knows if you have just yelled hole and have not pointed it out. This may cause some riders to scan to the left, other to the right and center. Other riders might think you yelled car. It is a confusion that should be avoided.
Rule 10: Slowing and Adjusting Speed
This is probably the biggest crash causer on group rides. For some reason, when someone slows down ahead of them, a lot of riders jump for their brakes and yank the heck out of them, almost skidding and taking everyone down with them.
You should be riding ever-so-slightly to the side of the rider in front of you, so when they slow down you either stop pedaling and start to slightly overlap your front wheel with their rear wheel, or you touch the brakes gradually and use the "wheel overlap" as a buffer zone to avoid slowly too suddenly for the riders behind you.
These tips come from very simple principles that aim for general safety during a group ride. Try your best to stick to them and spread the good word to your fellow newcomers to the sport. Happy riding!
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