Last summer, I carried with an X-Project holster in my Jeep with the door tops off. To reveal my (holstered) gun to someone on my left side, I just had to move my arm to the steering wheel.
Wasn't worth it, IMO. Much easier to smile and nod at an *******, lead him to a public place, or draw on him once he makes it clear he's a real threat.
Several years ago, I witnessed a guy raging against an older woman in the car in front of him. She was visibly frazzled, watching her mirror as he was riding her bumper, swearing at her out his window. We stopped on opposite sides of a 4-way stop intersection, and when they passed, I looked him in the eye and called him an effing a-hole. Got the reaction I wanted - he spun around behind me, left the lady alone, and started riding my bumper. I drove towards the police station with him riding my ass. I planned to brake-check him right out front and let his demeanor do the talking. Instead, he tried to pass me at an excessive rate of speed when the road opened up to 4 lanes, I slammed on the brakes when he got into the next lane, he swerved into my lane, and the cop shooting radar saw the whole thing.
Happysniper1, I agree with everything you said; it's better to de-escalate the situation than to save face in front of an *******.
Just out of curiosity, though, what about when the assailant is armed with a car?