Why don't most states number exits on non-interstate expressways?

[kirbykart]

New York generally doesn't, but there are exceptions. Most of these involve state route extensions of 3dis. The Parkways have mostly unnumbered exits.

[TheHighwayMan3561]

MN has numbered portions of some non-Interstate freeways, but the vast majority of those remain unnumbered.

[jp the roadgeek]

New York generally doesn't, but there are exceptions. Most of these involve state route extensions of 3dis. The Parkways have mostly unnumbered exits.

Most of the NYC and LI parkways do have exit numbers.  The Taconic just added them a few years ago and The Hutch converted to mileage based exits a couple years me ago.  But the GCP/Northern State, Southern State/Heckscher, Belt/Cross Island, Saw Mill, and all the north/south LI parkways (with a lettered prefix) have exit numbers. 

[Road Hog]

US 67/167 northeast of Little Rock started numbering exits in the 1970s once the highway got up to Cabot, and kept the system all the way up to Walnut Ridge today. Wise move, because of the coming I-57 designation.

[kirbykart]

New York generally doesn't, but there are exceptions. Most of these involve state route extensions of 3dis. The Parkways have mostly unnumbered exits.

Most of the NYC and LI parkways do have exit numbers.  The Taconic just added them a few years ago and The Hutch converted to mileage based exits a couple years me ago.  But the GCP/Northern State, Southern State/Heckscher, Belt/Cross Island, Saw Mill, and all the north/south LI parkways (with a lettered prefix) have exit numbers.

I didn't even think about LI Parkways.  I actually didn't know about new exit numbers on the Taconic. So I guess most Parkways have numbers, most other non-Interstate freeways do not.
When I said mostly unnumbered exits on parkways, I was thinking of NSP (formerly Robert Moses) and LOSP.

[MASTERNC]

Pennsylvania does not number exits on most non-Interstate highways.  The exceptions I can think of are PA 28 in Pittsburgh and PA 60 near the Pittsburgh airport (before it became I-376)

[MATraveler128]

Pennsylvania does not number exits on most non-Interstate highways.  The exceptions I can think of are PA 28 in Pittsburgh and PA 60 near the Pittsburgh airport (before it became I-376)

The US 6 freeway from Scranton to Carbondale uses exit numbers as well as PA 378 in Bethlehem. Both schemes are sequential.

[jp the roadgeek]

Pennsylvania does not number exits on most non-Interstate highways.  The exceptions I can think of are PA 28 in Pittsburgh and PA 60 near the Pittsburgh airport (before it became I-376)

The US 6 freeway from Scranton to Carbondale uses exit numbers as well as PA 378 in Bethlehem. Both schemes are sequential.

As are PA 28's.  Plus the mile markers on that section of US 6 are based on freeway miles, not on actual miles in the state.  Otherwise, you'd have some exit numbers in the 300's on that section.  PA 43 does have mileage based exit numbers, except there are no numbers on the portions concurrent with US 119 and US 40.

[sbeaver44]

Pennsylvania does not number exits on most non-Interstate highways.  The exceptions I can think of are PA 28 in Pittsburgh and PA 60 near the Pittsburgh airport (before it became I-376)

The US 6 freeway from Scranton to Carbondale uses exit numbers as well as PA 378 in Bethlehem. Both schemes are sequential.

As are PA 28's.  Plus the mile markers on that section of US 6 are based on freeway miles, not on actual miles in the state.  Otherwise, you'd have some exit numbers in the 300's on that section.  PA 43 does have mileage based exit numbers, except there are no numbers on the portions concurrent with US 119 and US 40.

PA 581 has exit numbers too – they are also sequential, although the exits are close enough together they pretty much line up with mile markers, except for the I-83 junction.

[MATraveler128]

The only freeways in Massachusetts that have unnumbered exits are MA 57 from Agawam to Springfield, MA 28 in Falmouth, US 44 west of Plymouth, and US 1 Northeast Expressway.

Edit: MA 79 in Fall River is unnumbered as well.

[hotdogPi]

The only freeways in Massachusetts that have unnumbered exits are MA 57 from Agawam to Springfield, MA 28 in Falmouth, US 44 west of Plymouth, and US 1 Northeast Expressway.

MA 79 in Fall River, Plimoth Plantation Highway, MA 18 in New Bedford, MA 116 in Amherst (although that's only one exit), Storrow Drive/Soldiers Field Rd, US 1 in Newburyport, MA 1A near the airport, US 5 in West Springfield, MA 88

That said, most of these are really short.

[MATraveler128]

The only freeways in Massachusetts that have unnumbered exits are MA 57 from Agawam to Springfield, MA 28 in Falmouth, US 44 west of Plymouth, and US 1 Northeast Expressway.

MA 79 in Fall River, Plimoth Plantation Highway, MA 18 in New Bedford, MA 116 in Amherst (although that's only one exit), Storrow Drive/Soldiers Field Rd, US 1 in Newburyport, MA 1A near the airport, US 5 in West Springfield, MA 88

That said, most of these are really short.

I always forget that those are actually freeways. But adding exit numbers to these would only make things more confusing.

[Ted$8roadFan]

In RI, most non-interstate freeways have exit numbers. The only ones I'm aware of that don't are the East Shore Expressway (Ri-114) between East Providence and Barrington and the RI-138 freeway between North Kingstown and the Newport/Pell Bridge.

[MATraveler128]

In RI, most non-interstate freeways have exit numbers. The only ones I'm aware of that don't are the East Shore Expressway (Ri-114) between East Providence and Barrington and the RI-138 freeway between North Kingstown and the Newport/Pell Bridge.

US 6 from Johnstown to Providence also doesn't have exit numbers.

[fwydriver405]

US Route 4 and 7 in Vermont, if I recall correctly, have sequential exit numbers (with MILEPOINT EXIT XXX signs) on the freeway portions of those routes.

Vermont Route 289 not only has exit numbers through its short 6.34 km (3.94 mi) journey as a two lane expressway around Essex, all of the numbers are true mileage based (from the proposed western terminus at VT Route 127).

https://vtrans.vermont.gov/projects/exit-numbering