So the IR communicator is for bicycles. Very impractical.
If you mount the IR transmitters and detectors on the front of your helmets, you would need to point them at each other (like your TV remote) and crash off the road!
I guess you could use an array of transmitters and detectors surrounding your helmets, like used for language translation in seminars, but you would need to carry around car batteries to power them. Well, maybe a bunch of AA cells might last for a while, certainly not 9V batteries.
Use efficient low-power RF like everyone else.