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@d_c
From Bicycling Science - the maximum deceleration of a cyclist with any kind of brakes before they go over the handlebars is about 0.5g. For a motor car (and a tandem) it is limited by the tyre to road friction and goes up to about 0.8g - 60% better than a bicycle.
The moral of this tale? Watch out when drafting 'cause they can stop quicker than you and stacking the back of a vehicle can hurt.