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Unconventional Interchanges (and intersections) in Maryland

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talllguy:
Greetings all,

I am working on a list/map of unconventional interchanges and intersections in Maryland for MDOT SHA. Unconventional interchanges include SPUI, diverging diamond, double roundabout, etc. I've put a map together of the 40 that I am aware of. Can anyone here think of any that I missed? Here's the list. Map link above.

Grade-separated & Signalized

Single Point Urban Interchange
1. I-695 & MD 140, Pikesville
2. MD 100 & MD 170, Severn
3. US 29 & Cherry Hill Rd., Silver Spring
4. MD 337 & MD 5, Camp Springs
5. MD 200 & MD 650, Colesville

Single Loop Interchange
1. MD 140 & MD 940, Owings Mills

Tight Diamond Interchange
1. MD 32 & MD 108, Columbia
2. MD 100 & Coca Cola Dr., Hanover

Diverging Diamond Interchange
1. MD 295 & Arundel Mills Blvd, Hanover

Grade-separated & Unsignalized

Double Roundabout Interchange
1. MD 100 & MD 103, Elkridge
2. US 29 & MD 216, Scaggsville

At-grade & Signalized

Jughandle Intersection
1. Hanover St. / Cromwell St., Baltimore

Superstreet Intersection
1. MD 3 & Waugh Chapel Rd., Odenton

Continuous Flow Intersection
1. MD 210 & MD 228, Accokeek
2. US 1 & MD 200(to be opened in 2014)

Continuous Green-T Intersection
1. US 40 & Enchanted Forest, Ellicott City
2. US 29 & Rivers Edge Rd., Columbia
3. MD 139 & Chestnut Ave., Towson
4. MD 100 & US 1, Elkridge

At-grade & Unsignalized

Maryland J-turn Intersection

1. US 15 & Hayward Rd., Frederick
2. US 15 & Willow Rd., Frederick
3. US 15 & Biggs Ford Rd., Frederick
4. US 15 & Sundays Ln., Frederick
5. US 15 & College Ln., Emmitsburg
6. US 15 & Old Frederick Rd., Emmitsburg
7. US 301 & Main St. Queenstown
8. US 301 & Del Rhodes Ave., Queenstown
9. US 301 & Ruthsburg Rd., Centreville
10. US 301 & Sudlersville Rd., Sudlersville
11. US 301 & McGinnes Rd., Millington
12. US 301 & Galena Rd., Galena

Maryland T Intersection
1. MD 235 & MD 6, Mechanicsville
2. US 50 & Carmichael Rd., Queenstown
3. MD 5 & Gallant Green Rd., Hughesville
4. MD 5 & Old Leonardtown Rd., Hughesville
5. Arundel Mills Circle & Mills Dr., Hanover

Modern Painted Roundabout
1. US 50 & Thompson Creek Rd., Stevensville

My source data is mainly from 2016 so there could be some new ones around the state.

Thank you!

-Elliott Plack
Consultant for MDOT

1995hoo:
There's a grade-separated double roundabout interchange at Exit 13 on the Capital Beltway, Ritchie-Marlboro Road in PG County.

https://www.google.com/maps/@38.8676991,-76.8490137,15.92z

jakeroot:
Welcome back talllguy! Great to see you again.

This is a great list. Maryland has some very interesting interchange designs. I am particularly fascinated with their roundabout history. There is a lot across the whole state and they seem to have experimented with almost every kind of design philosophy.

Never heard the term "Maryland T" but this seems to be a T-intersection with a missing movement?

Never heard the term "Single Loop Interchange" either, but I like the terminology. British Columbia has a couple of these as well.





--- Quote from: 1995hoo on August 19, 2021, 12:43:24 PM ---There's a grade-separated double roundabout interchange at Exit 13 on the Capital Beltway, Ritchie-Marlboro Road in PG County.

https://www.google.com/maps/@38.8676991,-76.8490137,15.92z

--- End quote ---

The history of that roundabout is quite intriguing. Sort-of British-like when first opened: no markings, no arrows, equal roadway width all the way around. Since modified of course. Reminds me of the early roundabouts in the mountains of Colorado back in the 90s.


Ritchie-Marlboro Interchange by Jacob Root, on Flickr

jmacswimmer:
Adding in a couple SPUI's:

- I-70/US 40 & MD 85, Frederick
- I-270 & MD 189, Rockville
- MD 5 & MD 223, Clinton

kphoger:

--- Quote from: jakeroot on August 19, 2021, 12:59:24 PM ---Never heard the term "Single Loop Interchange" either, but I like the terminology. British Columbia has a couple of these as well.

--- End quote ---

Parclo A1   :hmmm:

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