Not that helmets would have prevented this accident. A few years back we were all congregated at my sons house and cars were parked in the grass off the street. The neighborhood had lots of golf carts that ran the streets. One idiot lady came by with her 5-6 year old son in the seat beside her holding a small dog with a lease. The dog saw a rabbit in the grass and leaped out of the cart pulling the young boy with him. He rolled harmlessly to the grass still holding the lease, but the stupid lady baled out of the cart to run to her son rather than stop it. It was going at least 10 MPH and continued to travel across the road just barely scrapping a cousins Mercedes front bumper before plowing into my granddaughters little Mitsibushi. It caved the whole rear fender in. Seat belts would have prevented this scenario, but I have never seen a golf cart with a seat belt. The idiot ladies only excuse for not stopping was that she was worried about her son. That being the case, a simple stomp on the brake would have gotten her stopped just as quickly. Some folks shouldn't be operating motorized equipment, or knifes or other sharp instruments. At least they did pay for the repair to my Grand Daughters car.
BTW, I don't use helmets or seat belts in my UTV but I rarely exceed 10 MPH with it either and hardly ever has it been on the roadway.