3A shares a concurrency with NH 102 along Derry Street. NH 102 begins at the Taylor Falls/Veterans Memorial twin span bridge over the Merrimack River, and after a brief concurrency with NH 111, joins NH 3A for a concurrency along Derry Street. After 3A leaves Derry Street, 102 continues along it to the northeast passing through a small portion of Litchfield, then returning into Hudson briefly before crossing into Londonderry. NH 111 enters the town at the Taylor Falls/Veterans Memorial bridge from Nashua and has a brief concurrency with NH 102. 111 follows Ferry Street, Burnham Road, and Central Street as the main east-west route across town. It leaves at the town's eastern edge entering the town of Windham. In addition to the three numbered state highways, about half of a two-mile section of the as-yet uncompleted Circumferential Highway also exists in Hudson. The road currently serves to connect Hudson to the Everett Turnpike in Nashua, using the Sagamore Bridge across the Merrimack River. The nearest airports are Boire Field in Nashua and Manchester–Boston Regional Airport along the border of Londonderry and Manchester. The nearest rail service is the Lowell Line of the MBTA Commuter Rail which can be accessed at the Charles A. Gallagher Transit Terminal in Lowell, Massachusetts. The nearest Amtrak stations are Boston's North Station or South Station. The nearest intercity bus depot is at the Nashua Transit Center in Nashua. Hudson currently has no public transportation in the town; though a street trolley formerly ran through the town connecting it to neighboring communities. Sites of interest Two small recreational lakes exist within the town borders. Robinson (or Robinson's) Pond in the northern part of the town features a public access beach and boat ramp that can be accessed via Robinson Road. Otternic Pond (locally called "Tonic Pond"), located between Hudson Center and Hudson Village, has a public boat landing (Claveau Landing) that can be accessed off Highland Street. Both ponds are often used for fishing during the summer and skating and ice hockey during the winter. Musquash Pond (or Swamp), located in the southern part of the town, is a wild bird sanctuary and is utilized as a breeding ground by several threatened and endangered species of birds. In the early 1900s hunters would travel by horse from as far as Derry to camp and stalk game in the renowned swamp. Benson's Wild Animal Farm reopened