Take exit 31B, Route 4/225 toward Bedford

Merge onto Route 4/225

Go left on Hartwell Avenue via right lane jug handle exit, just before first traffic light

Proceed approximately 2 miles down Hartwell Avenue

131 is the last building on the right before the Hanscom Air Force Base

LeadSpark is on the second floor

Take exit 14, Route 128/I-95 North

Merge onto Route 128/I-95 North

Follow Route 128/I-95 directions above

Follow the signs to the Sumner Tunnel

Go through the tunnel

Immediately after exiting the tunnel, take I-93 North

Take I-93 North to Route 128/I-95 South, exit 37B

Merge onto Route 128/I-95 North

Follow Route 128/I-95 directions above