Rennrad Aero-Triathlon Lenker

No. Tri bars are designed to make individual riders faster when riding alone. The position reduces control in terms of stearing and braking, and so would be dangerous in group rides or bunched racing.

No guarentees, but probably yes. Compared to riding in a standard road bike bar position, tri bars make most riders more aerodynamic, they are the most cost effective way to 'buy speed' on a regular road bike. Tri bars can only be used in individual races, such as time trials and triathlons, not group rides or bunched racing.