Funny... I was just laughing at this specific notice the other night.
I was discussing CANLANDGENs and CANFORGENs with the DCO of my unit and he brought up the CANLANDGEN which outlines the wearing of helmets in all civilian pattern vehicles used by the DND in a training environment or on exercise. But, it did state that only the passengers in the back seats had to wear helmets, citing a study on the effectiveness of airbags for the driver and passenger in the front, and how there was no conclusive study on injuries when sitting in the back seat during a collision.
So essentially it states that the driver and co-driver (front seat passenger) don't have to wear a helmet, but everyone in the back does, in any civilian or military vehicle equipped with airbags, but only during an exercise. And any vehicle not equipped with airbags (SMP MSE); all personnel must wear a helmet... during an ex.
I had suggested that we invite the LF commander to come out on an ex and provide him with a staff car avec complimentary skid-lid and a copy of the CANLANDGEN in the back seat... and have the driver refuse to drive until he dons the gear... while the driver wears just his silly hat.
;D
Anyway, I've been searching around for the specific CANLANDGEN pertaining to this silliness, but haven't been able to find it... It's fairly recent; within the last few months. If someone finds it, please let me know the ref number, I'd like to get my hands on a copy to add to a list of silly rules.