https://www.google.com/maps/@44.1889238,-88.4875221,17.01z?hl=en
I-41 Exit 132 in Neenah, WI has exit ramps in both directions to Main St/Oakridge Rd. There are no entrance ramps from Main St/Oakridge Rd to I-41. Are there any other interchanges that have exit ramps in both directions without entrance ramps?
I-287 exit 33 is kind of like this, but there are entrances at the next overpass to the north.
http://www.google.com/maps/@40.7704632,-74.4844692,15z
I'll nominate I-278 exit 23: https://www.google.com/maps/@40.6536366,-74.007767,17.21z?hl=en
I can think of an example of the reverse: Where I-190 meets the Robert Moses State Parkway near the bridge to Canada, traffic can enter each direction, but can't exit (didn't use to be the case; the parkway NB used to be able to get to I-190, but that ramp was removed and the ROW used for the entrance ramp when the SB carriageway was closed and all traffic put on the NB carriageway).
https://www.google.com/maps/@43.1493511,-79.0389066,581m/data=!3m1!1e3?hl=en
Here's one that technically counts, and only exists because of a signage quirk: the exits for Paul Avenue off of US 101 in San Francisco's Bayview neighborhood.
Southbound, there's only an onramp to San Bruno Avenue and Mansell Street (one has to backtrack north a block to get to Paul).
Northbound, the ramp signed for Paul is what used to be labeled as the "Bayshore Boulevard" exit until about 6 years ago; Bayshore itself does have an onramp to 101, but one that isn't accessible easily from anyone starting off on Paul Avenue. The nearest northbound onramp used to be a mile up Bayshore near Silver Avenue, but that was removed in the last decade or so.
Quote from: TheStranger on October 21, 2016, 06:11:17 PM
Here's one that technically counts, and only exists because of a signage quirk: the exits for Paul Avenue off of US 101 in San Francisco's Bayview neighborhood.
The ramp from Bayshore to US 101 south is clearly the counterpart to the northbound exit 429C to Bayshore/Paul.
Quote from: NE2 on October 21, 2016, 06:55:43 PM
Quote from: TheStranger on October 21, 2016, 06:11:17 PM
Here's one that technically counts, and only exists because of a signage quirk: the exits for Paul Avenue off of US 101 in San Francisco's Bayview neighborhood.
The ramp from Bayshore to US 101 south is clearly the counterpart to the northbound exit 429C to Bayshore/Paul.
I always thought that was the southbound onramp to correspond to the "Third Street/Cow Palace" southbound ramp off of 101, one exit past Paul Avenue.
(i.e. while the onramp from the Alemany/Bayshore circle to 101 north now serves as the only ramp access for drivers around the Silver/Bayshore intersection area, the original companion ramp for the northbound Silver Avenue exit is the closed onramp that used to be there, with the Alemany onramp complementing the northbound offramp into the circle)
In any case I only brought up this example because the northbound Paul Avenue exit only exists as a result of re-signing that ramp, rather than any configuration changes at that interchange.
We have one in Chicagoland:
Washington at the Kennedy (https://goo.gl/maps/h46RsH8zVrn)
There's also a bunch of one-ramp wonders with only an exit ramp or an entrance ramp.
Well, I was beaten to I-278, but there are a hell of a lot of one-ramp wonders in New York. A LOT. There's the random entrance ramp in the middle of I-278 Exit 29, Sunrise Highway Exit 46A, the entrance ramp to I-287 at Hillburn, the random entrance ramps on I-190 south of Exit 15...
Of course, then you get the oddities like NY 27 Exits 3-4, where the exit ramps are across from each other. Fastest way to get to 8th Avenue from the West? Get off at 4, make a U-turn at 11th Avenue and get back on, only to immediately get off at 3.
Does it count where the onramps are some distance away from the interchange and reached only by frontage roads? If so, DC-295 at Burroughs Avenue, SE, could qualify. There are exit ramps at Burroughs in each direction, but entering 295 requires driving down a frontage road for some distance.