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