Re: problem...
wouldn't that be legally considered as entrapment?
IANAL, and who knows how courts would interpret it; but I can see an argument that it's not entrapment. You're not enticing someone to commit a crime. First, you're not communicating with the driver directly - you're just publishing a notice via the app. Second, they've already agreed, in principle, to commit a crime, and you're merely suggesting where it might occur.