Delaware Route 100
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| Route information | ||||
| Maintained by DelDOT | ||||
| Length: | 8.97 mi (14.44 km) | |||
| Existed: | 1938 – present | |||
| Tourist routes: |
 Brandywine Valley National Scenic Byway
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| Major junctions | ||||
| South end: |
 DE 4 near Elsmere
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 DE 2 in Elsmere DE 34 near Elsmere DE 48 near Wilmington DE 141 near Wilmington DE 52 in Greenville DE 92 in Montchanin
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| North end: | SR 3100 at Pennsylvania border near Montchanin | |||
| Location | ||||
| Counties: | New Castle | |||
| Highway system | ||||
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Delaware Route 100 (DE 100) is a state highway in New Castle County, Delaware. The route runs from DE 4 near Elsmere to the Pennsylvania border near Montchanin, where it continues into Pennsylvania as State Route 3100 (SR 3100, Chadds Ford Road). The road runs through suburban areas of northern New Castle County. It intersects with DE 2 in Elsmere and DE 34 north of Elsmere before forming separate concurrencies with DE 48 and DE 141 from west of Wilmington north to Greenville. In Greenville, there is an interchange with DE 52. North of Greenville, DE 100 continues by itself to the Pennsylvania border, intersecting DE 92 in Montchanin. DE 100 was first designated in the 1930s to run from DE 52 to the Pennsylvania border, where it originally connected to Pennsylvania Route 100 (PA 100). By the 1970s, it was extended south to DE 4. The route was realigned to follow parts of DE 48 and DE 141 by 1990.
DE 100 begins at an intersection with DE 4 southwest of Wilmington, heading north on the one-way pair of Race Street northbound and South Dupont Road southbound. The one-way pair, which carries two lanes in each direction, passes through suburban residential areas. Both directions of the route join, with the route continuing northwest as South Dupont Road, a four-lane divided highway. DE 100 curves north and enters Elsmere, where it runs through industrial areas and comes to a bridge over CSX's Philadelphia Subdivision. A short distance later, the route crosses DE 2 and becomes North Dupont Road, where it becomes an undivided road and passes over an East Penn Railroad line on a bridge. The road continues through wooded residential areas, leaving Elsmere and becoming South Dupont Road. The route reaches an intersection with the eastern terminus of DE 34. Following this intersection, DE 100 passes to the east of a cemetery before reaching an intersection with DE 48 south of the Cab Calloway School of the Arts and Charter School of Wilmington.
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