I don't think that our vehicular habits need to be a matter of great secrecy, grahame, and there is a good discussion starting here.
Difficult call .. and now hypothetical as it's been made. 38 members have voted on the new thread and a dozen different people commented and I know that a none-zero number of those would not have posted as openly in public. I
have quoted much of the recent discussion here in public onto the thread as that data seeds and cherishes the topic.
The general principle applied in making the call is that there is a proportion of their personal or near-personsal data that members are happy to share with our known "club" of perhaps 400 who have established themselves as responsible members by making a certain number of posts without ringing alarm bells, but do not want to share with the 6,000 people who happen to visit the site, uncontrolled, each month and who can easily copy, paste, quote, misuse that information in any way they wish.
Your personal story / follow up is an excellent one to follow up the conversation and (give me a few minutes to put on a pot of coffee) I will follow it up, quoted, in frequent posters now.