How to signal Golf Carts that didn't cancel turn signal ?
 

Have definitely seen this fairly frequently, Golf Carts that have their turn signals blinking
when they have obviously failed to turn the signal off.
Is there any effective/acceptable way to signal them from a vehicle to get their attention
to cancel their turn blinking ? (To do it the safest way.)

Catch the eyes of the driver then cup your hand and open it, cup and open to indicate blinking you can also point towards the golf cart lights.

I agree.

This is not an answer to your question, but, I just installed turn signal "beepers" on our Yamaha. About $9.00 on Amazon, not a very big job. I suggest others do the same, because it is easy to forget to turn off you signal.

No.
I have tried several methods to get drivers to know that their turn signal is on. After about 20 tries I give up. Not a one understood what I was doing and kept right on blinking. This is especially true when I overtake a slower cart and try to hail them as I pass. It seems to startle them, and I am afraid someone might accidently swerve and bump the curb. I never pull out in front of a cart that is approaching an intersection with its turn signal on. Me?......I never forget to turn mine off. :)

Amazing that self canceling turn signals or seat belts don't come standard with a 2023 Yamaha, it's an upcharge.

I have self canceling turn signals and after many adjustments they still don't turn off a lot. The problem is they need a good half turn of the steering wheel to cancel the signal. Most turns here are a quarter turn at most.

I just yell "TURN SIGNAL!" to them, usually works.

This is used by motorcyclists;

16 Motorcycle Hand Signals for Group Riding - MLF Blog

I disconnected my beeper and drove around a month with the signals flashing just like everyone else and then decided to hook it back up.

Oh that was you that made me miss my tee time because I had to go home and change my shorts.

Sorry you missed your tee time. But, is your blinker still on?

Did you try adding "blinker fluid"?:laugh:

Would probably work----if all cart drivers in TV knew them. Alas, I doubt even 1% do.

Most of us are fairly adept at one hand signal.