Editing Mercer County, New Jersey (section)

===Roads and highways===
Mercer County has county routes, state routes, U.S. Routes and Interstates that all pass through. {{As of|2010}}, the county had a total of {{convert|1524.30|mi}} of roadways, of which {{convert|1216.48|mi}} were maintained by the local municipality, {{convert|175.80|mi}} by Mercer County, {{convert|118.99|mi}} by the [[New Jersey Department of Transportation]], {{convert|1.19|mi}} by the [[Delaware River Joint Toll Bridge Commission]] and {{convert|12.43|mi}} by the [[New Jersey Turnpike Authority]].<ref>[https://www.state.nj.us/transportation/refdata/sldiag/pdf/mileage_Mercer.pdf Mercer County Mileage by Municipality and Jurisdiction], [[New Jersey Department of Transportation]], March 2019. Accessed December 26, 2020.</ref>


Mercer County is served by the following major roadways:<ref>{{Cite web |title=NJDOT SLD Sheet Viewer |url=https://njsld.org/NJDOT/SLD/SheetViewer |access-date=November 26, 2023 |website=njsld.org}}</ref>

* [[U.S. Route 1 in New Jersey|U.S. Route 1]] (Which bisects the county)
* [[U.S. Route 1 Business (Trenton, New Jersey)|U.S. Route 1 Business]]
* [[New Jersey Route 27|Route 27]] (Only in [[Princeton, New Jersey|Princeton]])
* [[New Jersey Route 29|Route 29]]
* [[New Jersey Route 31|Route 31]]
* [[New Jersey Route 33|Route 33]]
* [[New Jersey Route 64|Route 64]] (A small state-maintained bridge located in [[West Windsor, New Jersey|West Windsor]])
* [[Interstate 95 in New Jersey|Interstate 95]] ([[New Jersey Turnpike]])
* [[New Jersey Route 129|Route 129]]
* [[U.S. Route 130]]
* [[New Jersey Route 133|Route 133]] (Only in [[East Windsor, New Jersey|East Windsor]])
* [[Interstate 195 (New Jersey)|Interstate 195]]
* [[U.S. Route 206]]
* [[Interstate 295 (New Jersey)|Interstate 295]]

I-295 functions as a partial ring-road around the Trenton area, while I-195 serves as an east–west expressway from Trenton to the [[Jersey Shore]]. The New Jersey Turnpike (I-95) passes through the southeastern section of the county, and serves as a major corridor to [[Delaware]], [[Washington, D.C.]] to the south, and [[New York City]] and [[New England]] towards the north. Two turnpike interchanges are located within Mercer County: Exit 7A in [[Robbinsville Township, New Jersey|Robbinsville Township]] and Exit 8 in [[East Windsor Township, New Jersey|East Windsor Township]].

Before 2018, Interstate 95 abruptly ended at the interchange with US 1 in [[Lawrence Township, Mercer County, New Jersey|Lawrence Township]], and became I-295 south. Signs directed motorists to the continuation of I-95 by using I-295 to I-195 east to the New Jersey Turnpike. This was all due in part to the cancellation of the [[Somerset Freeway]] that was supposed to go from [[Hopewell Township, Mercer County, New Jersey|Hopewell Township]] in Mercer County up to [[Franklin Township, Somerset County, New Jersey|Franklin Township]] in [[Somerset County, New Jersey|Somerset County]].<ref>Frassinelli, Mike. [http://www.nj.com/news/index.ssf/2010/09/nj_pa_officials_plan_to_close.html "N.J., Pennsylvania officials plan to close longtime gap on Route 95"] {{webarchive|url=https://web.archive.org/web/20100910090636/http://www.nj.com/news/index.ssf/2010/09/nj_pa_officials_plan_to_close.html|date=September 10, 2010}}, ''[[The Star-Ledger]]'', September 7, 2010. Accessed October 24, 2017. "Plans to run I-95 north of Trenton to Route 287 near Perth Amboy as part of the 'Somerset Freeway' were scuttled in 1980 after residents in the Princeton area feared a potential loss in property values and their small-town feel."</ref>

The section of I-95 west of the US 1 interchange in Lawrence was re-numbered as part of I-295 in March 2018, six months before a [[Pennsylvania Turnpike/Interstate 95 Interchange Project|direct interchange]] with [[Interstate 95 in Pennsylvania]] and the [[Pennsylvania Turnpike]] opened.<ref>{{cite letter|last=Nadeau|first=Gregory G.|date=May 20, 2015|title=FHWA to AASHTO I-95 Designation|recipient=Bud Wright|location=Washington, DC|publisher=Federal Highway Administration|url=http://route.transportation.org/Documents/05%2014%202015%20Cheyenne%2c%20WY%20Report/FHWA%20to%20AASHTO%20I-95.Designation.pdf|format=PDF|access-date=June 8, 2015|url-status=dead|archive-url=https://web.archive.org/web/20150609165553/http://route.transportation.org/Documents/05%2014%202015%20Cheyenne%2C%20WY%20Report/FHWA%20to%20AASHTO%20I-95.Designation.pdf|archive-date=June 9, 2015}}</ref> This planned interchange indirectly prompted another project: the New Jersey Turnpike Authority extended the 'dual-dual' configuration (inner car lanes and outer truck / bus / car lanes) to Interchange 6 in [[Mansfield Township, Burlington County, New Jersey|Mansfield Township]], [[Burlington County, New Jersey|Burlington County]] from its former end at Interchange 8A in [[Monroe Township, Middlesex County, New Jersey|Monroe Township]], [[Middlesex County, New Jersey|Middlesex County]]. This widening was completed in early November 2014.<ref>[http://www.state.nj.us/turnpike/documents/NEWS_RELEASE_Gov_Christie_Commissioner_Fox_cut_ribbon_Turnpike_Widening.pdf Gov. Christie, NJDOT Commissioner FoxPraise $2.3 Billion NJ Turnpike Infrastructure Investment Project] {{webarchive|url=https://web.archive.org/web/20141103174930/http://www.state.nj.us/turnpike/documents/NEWS_RELEASE_Gov_Christie_Commissioner_Fox_cut_ribbon_Turnpike_Widening.pdf|date=November 3, 2014}}, [[New Jersey Turnpike Authority]]. Accessed November 3, 2014. "The Widening Program created a three-lane Outer Roadway in each direction over the 25 miles between Interchange 6 in Mansfield Township, Burlington County, and Interchange 8A in Monroe Township, Middlesex County."</ref>


The county roads that traverse through are [[County Route 518 (New Jersey)|County Route 518]] (only in the Hopewells), [[County Route 524 (New Jersey)|County Route 524]], [[County Route 526 (New Jersey)|County Route 526]], [[County Route 533 (New Jersey)|County Route 533]], [[County Route 535 (New Jersey)|County Route 535]], [[County Route 539 (New Jersey)|County Route 539]], [[County Route 546 (New Jersey)|County Route 546]], [[County Route 569 (New Jersey)|County Route 569]], [[County Route 571 (New Jersey)|County Route 571]], and [[County Route 583 (New Jersey)|County Route 583]].