mine and comes to the PA 136 exit. The Mon–Fayette Expressway crosses the Mingo Creek Viaduct into Union Township and continues north through wooded areas with some fields and mines. Farther north, the highway comes to a diamond interchange serving Finleyville-Elrama Road. Past this interchange, PA Turnpike 43 curves to the northeast. The tollway enters Jefferson Hills in Allegheny County, where it continues through more rural areas. The toll road reaches the Jefferson Hills mainline toll plaza and continues northeast, with the median widening and the road narrowing to one lane in each direction as it comes to a bridge over PA 51. The Mon–Fayette Expressway continues a short distance to its current northern terminus, where the traffic lanes turn west as Jefferson Boulevard and head to PA 51. Tolls The Mon–Fayette Expressway is a toll road for most of its length, and utilizes all-electronic tolling using toll-by-plate (which uses automatic license plate recognition to take a photo of the vehicle's license plate and mail a bill to the vehicle owner) or E-ZPass. Unlike the Pennsylvania Turnpike mainline and the Northeast Extension, which uses long-distance tickets, the Mon–Fayette Expressway collects fixed tolls at regular intervals. In addition, auxiliary toll plazas exist on certain on- and off-ramps. In 2008, the PTC retrofitted all toll plazas to accept E-ZPass, and Express E-ZPass lanes are available at the newer toll plazas. The Mon–Fayette Expressway has four mainline toll barriers located in Fairchance, Redstone, California, and Jefferson Hills. , the Fairchance and California barriers charge $4.40 using toll-by-plate and $1.80 using E-ZPass for passenger vehicles while the Redstone and Jefferson Hills barriers charge $5.30 using toll-by-plate and $2.70 using E-ZPass for passenger vehicles. There are also ramp toll plazas at the northbound exit and southbound entrances at exit 4, 15, and 18, the southbound exit and northbound entrance at exits 22 and 26, and the northbound exit and southbound entrance at exits 39, 44, and 48. The ramp tolls cost $3.20 using toll-by-plate and $1.40 using E-ZPass for passenger vehicles. All-electronic tolling was planned to be implemented on the Mon–Fayette Expressway, along with the remainder of the Pennsylvania Turnpike system, in the later part of 2021. However, in March 2020 the switch was made early as a result of the COVID-19 pandemic. In West Virginia, legislators have flip-flopped a few times regarding whether their section will be a toll road. When tolls were first