Maryland Route 100
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| MD 100 |
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| Paul T. Pitcher Memorial Highway | |||||||||||||
| Length: | 22.05 mi (35.49 km) | ||||||||||||
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| West end: |  US 29 in Columbia |
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| Major junctions: |
 MD 108 MD 103 I-95 US 1 MD 295 MD 170 I-97 MD 2 MD 10 |
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| East end: |  MD 177 in Pasadena |
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Maryland Route 100 is a major east-west highway connecting U.S. Route 29 in Ellicott City (just north of Columbia) and Maryland Route 177/Mountain Road in Pasadena. Route 100 also connects to Interstate 95, U.S. Route 1, the Baltimore-Washington Parkway, and Interstate 97. The highway connects Howard County to the west with Anne Arundel County and the Chesapeake Bay to the east. Route 100 also provides access to the Baltimore-Washington International Airport (BWI) and the Arundel Mills shopping mall.
The eastern section of Route 100 in Anne Arundel County is known as the Paul T. Pitcher Memorial Highway.
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[edit] Counties traversed
[edit] Route description
The route begins as a four-lane divided expressway at MD 177, continuing west and intersecting MD 607 near Jacobsville. Beyond this intersection, MD 100 upgrades into a four-lane grade-separated freeway and forms a bypass of MD 177. At MD 10, the carriageways split, with each carriageway merging with its counterpart from MD 10, forming a weave zone where traffic for each route must weave on the flat to stay on the same route.
Beyond this unusual interchange, MD 100 interchanges with MD 2 and follows one of the oldest segments of the highway as far as Interstate 97. Beyond here, the route increases from four to six lanes and interchanges with MD 170 Telegraph Road, where the route narrows to four lanes again. It also interchanges with MD 713 Arundel Mills Boulevard, the Baltimore-Washington Parkway, the Dorsey MARC station at Exit 7, and U.S. Route 1 before reaching Interstate 95. The segment between US 1 and I-95 is another one of the oldest segments of the highway.
Beyond I-95, the route increases to, and remains, six lanes through interchanges with MD 103, Snowden River Parkway, MD 104 and MD 108 before finally terminating at U.S. 29 near Ellicott City.
[edit] Junction list
| County | Location | Mile | # | Destinations | Notes |
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| Howard | Ellicott City | 0.0 | US 29 north/south - Columbia; Ellicott City (to  Interstate 70) |
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| 0.7 | 1A | Long Gate Parkway - to Maryland Route 103 |
no westbound exit | ||
| 1.4 | 1B | Center Park Drive | no eastbound exit; westbound entrance/exit signed as 1B-C | ||
| 1C | Executive Park Drive - to Maryland Route 108 |
eastbound entrance and eastbound exit | |||
| 2.5 | 2 | Maryland Route 108 /  Maryland Route 104 |
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| Columbia | 3 | Snowden River Parkway - Columbia | |||
| 4 | Maryland Route 103 - Meadowridge Rd. |
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| Elkridge | 5.4 | 5 | Interstate 95 - Baltimore; Washington, D.C. |
split into 5A and 5B | |
| 6.1 | 6 | U.S. Route 1 - Elkridge; Waterloo |
split into 6A and 6B on eastbound side only | ||
| 6.8 | 7 | Dorsey MARC Station | |||
| Anne Arundel | Dorsey | 7.4 | 8 | Coca-Cola Drive - to MD 103 |
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| 8.1 | 9 | Baltimore-Washington Parkway - Baltimore; Fort Meade |
split into 9A and 9B | ||
| Hanover | 9.1 | 10 |  Maryland Route 713 Arundel Mills Blvd. - Hanover; Arundel Mills |
split into 10A and 10B | |
| 11.1 | 11 | Maryland Route 170 Telegraph Road - Odenton; Linthicum |
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| 13.6 | 13 | Interstate 97 - Baltimore (via  I-695 /  I-895); Annapolis (to  MD 3 /  MD 32) |
split into 13A and 13B | ||
| Glen Burnie | 14.2 | 14 |  Maryland Route 174 Quarterfield Road |
eastbound exit and westbound entrance | |
| 15.6 | 15 | Oakwood Road | |||
| 16.8 | 16 | Maryland Route 2 - Glen Burnie; Pasadena |
split into 16A and 16B; 16B on westbound provides access via |
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| 17.4 | 17 | Maryland Route 10 north - Glen Burnie (to I-695) |
westbound exit and eastbound entrance | ||
| 18.3 | 18 | Maryland Route 10 south - Severna Park (to MD 2) |
eastbound exit and westbound entrance | ||
| 19.8 | 19 | Catherine Avenue | eastbound exit and westbound entrance | ||
| 20.6 | 20 | Edwin Raynor Boulevard - to  MD 173 Fort Smallwood Road |
eastbound exit and westbound entrance;  downgrades into four-lane at-grade expressway |
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| Jacobsville | 21.2 |  Maryland Route 607 / Hog Neck Rd. - to MD 177 |
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| Magothy Beach Rd. | |||||
| 22.1 | Maryland Route 177 / Mountain Rd. - Lake Shore, Gibson Island |
eastbound exit and westbound entrance; eastern terminus of |
[edit] History
Route 100 began in the 1970s as two separate roads, both retaining the Route 100 designation. The first was known as the Mountain Road Extension, stretching between Governor Ritchie Highway and the old Maryland Route 3, now Interstate 97. The second was built as a short spur between the newly constructed Interstate 95 and U.S. Route 1 in Elkridge, Maryland. The eastern section, originally known as the Mountain Road Bypass, was constructed east of Ritchie Highway in the late 1970s. Route 100 was completed west of I-97 to I-95, thereby connecting the two roads, in 1994, but it was not completed in its entirety to U.S. 29 until November 1998. A portion of the route between Exit 1B-C and Exit 2 was constructed earlier than the rest as an at-grade boulevard, on the right-of-way of the future eastbound lanes; this section was eventually upgraded. [1]
The route is part of the Baltimore Outer Beltway, a 3/4 circular beltway designed to provide a route parallel to the Baltimore Beltway. Route 100 represents the major portion that was built; U.S. 29 between Route 100's terminus and 29's own northern terminus at Maryland Route 99, four miles in length, is another portion. The Outer Beltway was projected beyond MD 99 to run through Howard and Baltimore Counties and intersect MD 140, Interstate 83, U.S. Route 1, and Interstate 95 before terminating at U.S. Highway 40 northeast of Baltimore.
[edit] Notes
- MD 10 and MD 100 cross one another near milepost 17; the two carriageways merge into a single four-lane weave zone, where traffic for each route must cross the traffic from the other route in order to stay on the same route.
- The cloverleaf ramp allowing access to MD 2 North from MD 100 East is an accident hotspot, with many drivers forgetting to slow down before entering the ramp and colliding with the earthworks beyond the ramp curb.
- The construction of the route near Lake Waterford Road severed the original road between Baltimore and Annapolis: the Baltimore-Annapolis Boulevard, signed in part as Maryland Route 648. The physical road ends at a pair of dead ends on either side of the right-of-way; MD 648 follows Lake Waterford Road between Baltimore-Annapolis Boulevard and MD 177 before rejoining its original path.
