Argie's Wife was right about the slowdown around the Chichester/Concord line. For a short distance through the lights in Chichester on Rt. 4, there are two lanes that merge back into one that can cause a bit of a bottleneck. There is also a fair amount of traffic in the afternoon as well. The Epsom traffic circle usually goes pretty smoothly.
Depending on where your friend is working in Concord, it may be easier to go Rt. 4 / Rt. 106 / Regional Drive / Old Turnpike Road / Manchester St. if she works in the south end.
I-393 can be hair-raising at times due to the number of irresponsible idiots on the road. For many, following at a safe distance is a foreign concept, along with signalling or adjusting speed in cases of inclement weather. As long as she drives defensively, she should be fine.
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