3mm will surely last 1500miles - particularly if it's mostly motorways.
I'd leave them tbh, and get them changed when you get back. I got through about 1mm on my rear tyres in over 3,000 miles. Got them changed when they were down to about 1mm.
If it's 3mm in total then change them. I changed my rear tyres a couple of weeks back for exactly the same reason. Had about 1mm above the marker, and am doing a 1,500 mile Euro-visit this week.
I would change them...You want to have grip don't you.... with bald tyres you are running the risk if an accident was to happen.. when having bald tyres stopping aint going to be that effective.
If your doing 1.5k mile drive... all those motorway miles... you don't want to have an accident do you?
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