Major junctions 
The list of major junctions in the infobox is uncomfortably long, yet every single one of them has a right to be there too. Even if Interstates and U.S. routes are only put in the list, it still makes the list incredibly long. -TheOneKEA (20070612 08:54)
I like the format that was chosen for noting the long multiplexes in the junction list, but I think the Intersection column should include notes about towns/cities/municipalities that can be reached by following the route intersected, as this is already done in all the other articles in the Roads in Maryland WikiProject.
Also, why were some of the Interstate highway intersections deleted from the infobox? -TheOneKEA (20070615 20:09)
- I think, if we do this, we need to decide what towns to include.
- I chose junctions that "define" the major cities. For instance, US 1 is the closest major intersection to the center of Baltimore; the I-695, I-95, and I-895 junctions are out in the outer parts of the city or suburbs. It's easy enough to use the junction list to find all junctions with Interstates. --NE2 04:13, 16 June 2007 (UTC)
Notes about openings 
Much of the information is from the National Bridge Inventory, and may be off by a year or two.
- 1932: PA to Hancock (partly reconstructed 1948)
- 1936-40: Hancock to Hagerstown (bypassed at Hagerstown in 1960; upgraded in the middle in 1960; bypassed at Hancock in 1965)
- 1947-48?: Hagerstown to Frederick (four-laned at Frederick in 1947 and 1969; four-laned at Hagerstown in 1966)
- January 1958?: Frederick Bypass, including Monocacy River bridge
- October 21, 1954: Monocacy River to 1 mi east of Ridgeville (upgraded in 1974; piece just east of Frederick bypassed in 1985)
- November 14, 1952: 1 mi east of Ridgeville to Morgan Station Road
- 1951-52?: Morgan Station Road to MD 32
- December 14?, 1950: MD 32 to MD 144
- 1939: MD 144 to Baltimore (widened from MD 144 to Rolling Road in 1948, with beginning of US 29 interchange completed then or soon after) (I-70N was built east of US 40 in 1969, extended over US 40 in 1972, and upgraded in 1974)
- 1935: Baltimore east to Havre de Grace
- 1940: Hatem Bridge and east to Delaware
Other notes 
A 1943 topo shows a bypass on Dogwood Road (!):  --NE2 12:18, 20 June 2007 (UTC)