Rochester. Route description NY 531 begins at NY 31 a half-mile (0.8 km) west of the northern terminus of NY 36. NY 31 and NY 531 then turn southwest and widens to four lanes shortly before intersecting with Washington Street (NY 36) at an at-grade intersection. At NY 36 intersection, NY 31 briefly follows the right of way of NY 36, before continuing west on Brockport-Spencerport Road. Past the junction with NY 36, NY 531 becomes a four-lane limited-access highway, passing through open fields as it heads east through rural Ogden. Directly south of Spencerport, NY 531 encounters South Union Street (NY 259) by way of a diamond interchange bordered on both sides by small housing tracts. The roadway continues eastward, reentering open and mostly undeveloped areas of the town. It heads past farmland for before turning southward a short distance east of an overpass carrying Gillett Road. NY 531 proceeds due south for , passing over Lyell Road at the midpoint of the segment, before returning to an east–west alignment just ahead of the Manitou Road exit, where NY 531 crosses into the town of Gates. Between Manitou Road and Elmgrove Road (NY 386), NY 531 is flanked on both sides by frontage roads in length. NY 531 eastbound connects to Manitou Road, NY 386, and the Rochester Tech Park solely by way of the south frontage road, designated NY 946E, while the north frontage road, designated NY 946F, acts as a collection road for the separate ramps to NY 386 and Manitou Road from NY 531 westbound. Both frontage road designations are unsigned reference routes; in fact, reference markers along the two roads display "531" for the route number instead of their respective designations. The westbound exit to the Rochester Tech Park, a standalone two-lane ramp that splits from NY 531 a short distance west of the NY 386 overpass, has no connection to the north frontage road. West of NY 386, the expressway expands to three lanes eastbound as it leaves the heavily commercialized and industrialized area around Elmgrove and Manitou Roads and enters a narrow, wooded area bordered by homes to the north. Not far to the east, NY 531 comes to an end at a slightly modified directional T interchange with I-490. Heading eastbound, the two leftmost lanes connect NY 531 to I-490 eastbound while the right lane links to I-490 westbound north of I-490's