Talking

Have you ever been in a mostly one-sided, but friendly conversation that you needed to end?  Maybe you needed the conversation to end because you had to meet a time deadline, or you had to complete another task, or the person was talking you into a coma.  What's a good and polite strategy?  You could say,  "Nice talking to you, but I have to run."  Then you could start walking away from the talker.  Imagine if the talker then says, "I'll walk with you to your car. I have plenty of time. We can keep talking on the way."  I guess you could walk to your car, but what if the talker continues talking while you get into your car?  Maybe you could say, "See you later. Take care."  Then, you could start your car and drive off slowly.  If  the person gets it, does not continue to talk and follow after, and does not get offended, you can consider this strategy a successful one. 
Smiles,
Sylvia