Interstate 75

Major North/South interstate going through Dayton. The through traffic lanes change location once downtown, so if you don't pay attention, you may find yourself unintentionally introduced to the downtown street grid.

The astute reader will notice I cover significantly more than the segment within Montgomery county. I actually cover I-75 from the Butler-Warren County Line to the Miami-Shelby County line, commonly accepted as covering the Greater Miami Valley region. More official definitions actually go all the way to Lima, so I try to keep it somewhat close to home.
Northbound	Southbound	Type	Description
Northbound	Southbound	Type	Description
EXIT 29 63 Monroe Lebanon		Diamond	As currently designed, ramps are substandard in length. ODOT has budgeted money to fix this within the next ten years.
EXIT 32 122 Middletown		Modified Diamond	The northbound exit and entrance ramps are actually loop ramps. A C/D system services these two ramps, protecting mainline northbound 75 from the resulting traffic weave
EXIT 36 123 Franklin Lebanon		Diamond
EXIT 38 73 Franklin Springboro		Modified Diamond
EXIT 43 675 NORTH Columbus		Double Trumpet	Go to 675
EXIT 44 725 Centerville Miamisburg		Diamond	A very congested interchange for the following reasons: the Dayton Mall and outlying strip malls No other way to get to West Carrolton or Moraine due to missing interchange movements at Central Avenue (more below) No other way to get to Miamisburg The Austin Road Interchange project (future exit 41) will remove the last bullet as a problem in the next few years. The rebuild of the Central Avenue interchange will remove the second bullet.
EXIT 47 Central Avenue West Carrolton		Hybrid	You can't quite call it "defies description", but it's close. Northbound Central Avenue (Dixie Highway, and in a life previous to that US 25) exits left to northbound 75, and southbound Central exits left to southbound 75. It almost resembles a merge/split caught with a half diamond in a transporter accident. The missing movements force a lot of traffic to go down to the OH 725 interchange, which contributes significantly to its congestion. If funding can be secured from ODOT, rebuilding this exit into a more conventional diamond would start in 2008.
EXIT 50a Dryden Road		Modified Diamond	There have been some long-term discussions about removing this exit (due to its proximity to Springboro Pike) and replacing it with a new interchange with an extended Dorothy Lane around mile marker 49. No serious planning on this has been performed.
	EXIT 50b 741 SOUTH Springboro Pike Kettering	Half Diamond
EXIT 51 Edwin C. Moses Boulevard Nicholas Road		Diamond	University of Dayton Arena and a big GM plant are both visibly accessible from this interchange. Traffic can get real interesting when there's an event at UD Arena -- interesting enough in my opinion to warrant auxilliary lanes to the exits on either side of this one. As part of improvements to the US 35 interchange, ODOT has budgeted money for unspecified special event improvements to traffic flow through this interchange.
EXIT 52a Albany Street Stewart Street		Diamond	Somehow, the designers of the US 35 interchange found room in the stack to work a full diamond-type interchange in. Though I have seen no official word, I get the impression that this exit will be removed as part of the improvements scheduled for the US 35 stack
EXIT 52b 35 Xenia Eaton		Stack	This interchange is currently designed to allow four-lane continuity through it for I-75. This is a known traffic bottleneck which is due to be fixed in the next few years. Current plans call for six lanes all the way through this interchange, which means some fairly significant bridge rebuilds will be necessary.
4 Germantown Street		Half Diamond	Even though the ramps parallel the US 35 right of way, access is only possible to/from I-75.
EXIT 53a Third Street		Modified Diamond	Southbound exits are to the left, as with the northbound entrance ramps. This is one of the many places through downtown Dayton in which the through lanes change. Travelers not aware of this end up getting unintentionally introduced to the downtown street grid.
EXIT 53b First Street	EXIT 53b Monument Avenue	Modified Diamond	Southbound exits are to the left, as with the northbound entrance ramps.
	EXIT 54a Grand Avenue	Half Diamond	Southbound exit is to the left Scheduled to be removed as part of the OH 4 interchange rebuild
EXIT 54b 48 Main Street		Modified Diamond	Northbound merge ramp comes in from the left and becomes a through lane. An extra hazard for northbound traffic at this point is a loop ramp from southbound Riverside to northbound I-75, which contributes an extra lane coming into Malfunction Junction (see below). A much more extensive partial cloverleaf used to exist here, but was removed in the late 1980's. An unusual wise move on ODOT's part, given the proximity of...
EXIT 54c 4 NORTH Webster Street Springfield	EXIT 54c 4 SOUTH Webster Street	Y	Extra ramps to Webster Street are accessible by first exiting onto SR 4 North. This interchange will be rebuilt into a double trumpet as part of the first phase of rebuilding I-75 through downtown Dayton. Go to 4
EXIT 55a Keowee Street	EXIT 55 Keowee Street	Diamond	An exit which does a good job attempting to kill northbound drivers trying to exit at Stanley Avenue 0.25 miles to the north.
EXIT 55b Leo Street		Diamond
EXIT 56a Stanley Avenue	EXIT 56 Stanley Avenue	Hybrid	The interchange with northbound traffic resembles a diamond. The interchange with southbound traffic resembles a cloverleaf
EXIT 56b Stanley Avenue		Hybrid
EXIT 57a Neva Drive		Half Diamond	Another of those exits which make you sit back and ask, "Why?" This exit dumps directly into a residential neighborhood, and serves no purpose other than to raise the blood pressure of drivers attempting to get sorted out on 75.
EXIT 57b Wagner Ford Road Neff Road	EXIT 57a Neff Road Wagner Ford Road Siebenthaler Ave	Diamond	A long time ago, there was an actual traffic circle here instead of a conventional interchange.
EXIT 58 Needmore Road		Diamond
EXIT 60 Benchwood/Wyse Road		Folded Diamond	This exit replaces the original Exit 60 at Little York Road half a mile to the north. The original exit had to be demolished in 2004 to accomodate the new exit ramps for the I-70 interchange
EXIT 61a 70 EAST Columbus		Cloverleaf	This exit is not only grossly underdesigned for the traffic load it is asked to handle, it is a deathtrap for anyone attempting to use it. ODOT has currently constructing a complete redesign of this interchange which will replace all but the 70 East to 75 North loop ramps with flyovers. This will all but eliminate the current problems with this interchange. Go to 70
EXIT 61b 70 WEST Indianapolis		Cloverleaf
EXIT 63 40 Vandailia Donnellsville		Diamond	This exit is about 0.25 miles from "downtown" Vandalia
EXIT 64 Northwoods Blvd		Diamond	A good way to avoid most of the crowds at the Dayton Air Show every July
EXIT 68 571 Tipp City West Milton		Diamond
EXIT 69 County Road 25		Modified Diamond	Old US 25, before decertification
EXIT 73 55 Troy Ludlow Falls		Diamond
EXIT 74 41 Troy Covington	EXIT 74b 41 EAST Troy	5-ramp	North of this exit, I-75 narrows from six lanes to four for the first time since Crittenden, KY. Funding had been allocated in the late 1990's to continue the six-lane stretch to Piqua, but those funds were diverted to the 70/75 interchange rebuild instead. Local authorities have reapplied for funding to build this project, but have yet to succeed.
	EXIT 74a 41 WEST Covington	5-ramp
EXIT 78 County Road 25a		Folded Diamond	The route US 25 took between Troy and Piqua before decertification
EXIT 82 36 Piqua Urbana		Diamond
EXIT 83 Piqua		Hybrid	The railroad line in the aerial photo made the ramp configuration neccessary. Southbound traffic sees this interchange as a half diamond. Northbound traffic sees this as a merge-split which terminates immediately onto the same county road.