[General] I am driving. I will call you later.

[sb70012]

Hi,
Suppose that I am driving but suddenly my friend calls me.
I answer him:
1. "Hi Alex. I am driving and I'll call you later."
2. "Hi Alex. I am driving and I'll get in contact with you later."
3. "Hi Alex. I am driving and I'll call you as soon as possible."
4. "Hi Alex. I am driving and I'll get in contact with you as soon as possible."
5. "Hi Alex. I am behind the wheel and I'll get in contact with you as soon as possible."
6. "Hi Alex. I am behind the wheel and I'll call you as soon as possible."

I don't know how to say that. In Iran we say: "I'm behind the wheel" but what about in English? I mean do you say like that or not? If you were me how would you say that?

Thank you.

 

[Tdol]

I would use the first- it's the shortest and this is a situation where the fastest message is the best IMO. We do say behind the wheel in BrE, but I wouldn't use it here.