What are the biggest changes to the interstate system over the past 20 years?

[sparker]

I-895 becoming NY 895, paving the way for future interstate de-designations.

Hopefully, only when the Interstate segment in question is either useless or superfluous; not because some ideologically-motivated or NIMBY-oriented group wants to make a point!

[hbelkins]

Cloverleafs are fine for low-volume interchanges, such as the Natcher/WK parkway interchange in Kentucky.

When you get high volumes of traffic with short merge/weave areas, such as the I-64/I-265 interchange, they fail.

[jon daly]

Cloverleafs are fine for low-volume interchanges, such as the Natcher/WK parkway interchange in Kentucky.

When you get high volumes of traffic with short merge/weave areas, such as the I-64/I-265 interchange, they fail.

Yeah, there's three on my ride from Mystic, Conn. to Providence. Two work fine, but one in a suburban area backs up; even with a C/D lane.

[Beltway]

Cloverleafs are fine for low-volume interchanges, such as the Natcher/WK parkway interchange in Kentucky.
When you get high volumes of traffic with short merge/weave areas, such as the I-64/I-265 interchange, they fail.

Full cloverleafs do fine under high volumes of traffic with long merge/weave areas. 

I mistakenly wrote this for I-64/I-295 (Richmond) before I realized the above is the Louisville outer loop.  It is still worth posting so I will leave it --

Neither I-64/I-295 interchange has short merge/weave areas.  The western interchange has only one loop.  The eastern interchange has long merge/weave areas and they are on C-D roadways where the volumes are not high.

[hbelkins]

I have noticed that some of the cloverleafs in New York and Illinois have decent-sized footprints, and C/D lanes can help alleviate some of the issues.

The 265 cloverleafs at 64, and 71 for that matter, don't have either adequate weaving space or C/D lanes. It becomes a mess during rush hour, especially traffic going east on 64 to north on 265, and that traffic has to weave with northbound 265 traffic exiting to 64 westbound.

[SteveG1988]

I have noticed that some of the cloverleafs in New York and Illinois have decent-sized footprints, and C/D lanes can help alleviate some of the issues.

The 265 cloverleafs at 64, and 71 for that matter, don't have either adequate weaving space or C/D lanes. It becomes a mess during rush hour, especially traffic going east on 64 to north on 265, and that traffic has to weave with northbound 265 traffic exiting to 64 westbound.

That one suuucks in a truck, if i cannot get over in to the weave in the truck i just bypass it for 264.

[mgk920]

Also I-90/290 in Schaumburg, IL.



Mike

[ftballfan]

I have noticed that some of the cloverleafs in New York and Illinois have decent-sized footprints, and C/D lanes can help alleviate some of the issues.

The 265 cloverleafs at 64, and 71 for that matter, don't have either adequate weaving space or C/D lanes. It becomes a mess during rush hour, especially traffic going east on 64 to north on 265, and that traffic has to weave with northbound 265 traffic exiting to 64 westbound.

I find the cloverleaf at US-131 and M-6 on the south side of Grand Rapids to be adequate (both roads have C/D lanes and the loop ramps seem larger than most other cloverleaves I've been through)

[Henry]

The additions of I-2, I-11, I-22, I-42, I-73 and the southern I-87, plus the extensions of I-69 and I-74.

[hotdogPi]

The additions of I-2, I-11, I-22, I-42, I-73 and the southern I-87, plus the extensions of I-69 and I-74.

11, 42, and southern 87 aren't big additions yet (neither is 14, which you didn't mention). However, 41 and the 49 extension are.

[akotchi]

As of this fall, the elimination of the I-95 gap in New Jersey.

Enhanced reference markers, larger presence of managed lanes (HOV/HOT lanes), travel time message signs and sensors