I270 is no problem during rush hour as the police want to keep traffic moving - otherwise you may want to keep it to no more than 10 mph over the posted limit. I haven't found much radar on I68 in MD, but it's always a possibility.
I realize you can't use it in VA & DC, but a good radar detector may be your best answer - they've saved me a bundle over the years. I use a battery powered Escort so it can be easily removed when crossing into DC or VA.
Have a good trip.
Tom
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