Interstate 70

This major east-west interstate passes just north of the Dayton Metro area.
Eastbound	Westbound	Type	Description
Eastbound	Westbound	Type	Description
EXIT 2 35 EAST Eaton		Merge/split	If you're eastbound, US 35 enters Ohio multiplexed with I-70. This is the exit where it strikes off on its own, heading southeast toward Eaton as a simple two-laned road.
EXIT 10 127 Greenville Eaton		Diamond
EXIT 15 513 Lewisburg West Alexandria		Diamond	The ramp structure on the west side of this interchange was dictated by a railroad overpass that used to closely parallel OH 513. The railroad line has long since been abandoned, and the overpass demolished sometime in the 1990's.
EXIT 22 County Road 533 Brookville		Diamond
EXIT 24 TO 49 Clayton		Partial Diamond	Allows access from SR 49 south to 70 west, and from Eastbound 70 to 49 north.
	EXIT 24 49 NORTH Greenville	Merge/split	49 begins a multiplex with I-70 at this point.
EXIT 26 49 SOUTH Trotwood		Merge/split
	TO 49 SOUTH Hoke Road	Partial Diamond	Allows access from SR 49 north to 70 East, and from 70 west to 49 south.
EXIT 29 48 Englewood		Modified Diamond	Short merge ramp back onto eastbound 70. This seems to be normal on this particular stretch of highway.
EXIT 32 Dayton International Airport		Trumpet	Unsigned freeway between I-70 and Dayton International. There is a single diamond interchange with US 40 before the airport grounds are entered and the freeway ends. There is a desparate need for auxilliary lanes between this exit and I-75
EXIT 33A 75 SOUTH Dayton		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 is currently in the middle of a five-year long project to upgrade this exit to a Flyover/3, with auxilliary lanes to both Airport Access Road and OH 202. Go to 75
EXIT 33B 75 NORTH Toledo		Cloverleaf
EXIT 36 202 Huber Heights		Folded Diamond	Another exit woefully underdesigned for the traffic load it is asked to handle. A major truck stop shares this exit with three strip malls and numerous professional office buildings. Even though all the ramps are located east of SR 202, enough vacant land exists west of the interchange to allow a modification to at least a six-ramp configuration. It appears that ODOT has realized this, for as of mid-2005 they are rebuilding this interchange into a more conventional diamond using this previously-vacant land. Moving the truck stop to the next exit east wouldn't hurt, either.
EXIT 38 201 Brandt Pike		Diamond	Entrance/exit ramps are rather shorter than the normal standard, but the problems with this interchange are just beginning. The bridge only allows for two through lanes on OH 201. This wouldn't be a problem except that 201 is five lanes either side of the interchange. Can you say, "traffic jam?"
EXIT 41A 4 235 SOUTH Fairborn	EXIT 41B 235 NORTH New Carlisle	Modified Flyover/1 with C/D	Westbound I-70 traffic uses one exit ramp to take either SR4 south or SR 235 north. The SR4 ramp becomes the left lane of southbound SR4. Collector/distributor ramp system for eastbound I-70, partial C/D for westbound (collecting all traffic wanting to take westbound 70 and providing a single merge). It is at this point, in the middle of farmland, that I-70 finally widens to six lanes. Ostensibly, this is because it is co-signed with OH 4 at this point. An oddity for westbound I-70 traffic is the presence of an unsigned merge ramp 0.5 miles east of the main interchange. I-70's right of way severely disrupted the alignment of Upper Valley Road when originally built, and this ramp is the only way traffic southbound on Upper Valley can reach SR 4
EXIT 41 A/B 4 235 Fairborn New Carlisle		Modified Flyover/1 with C/D
EXIT 44A 675 SOUTH Cincinnati		Cloverleaf with C/D	Collector/distributor system for Westbound I-70. Why they didn't use a flyover ramp instead from westbound 70 to southbound 675 remains a mystery to me.
EXIT 44B Spangler Road		Cloverleaf with C/D
EXIT 47 4 NORTH Springfield		Merge/Split	This was also the western terminus of Business Route 70. This exit used to be signed to indicate this back in the early 1970's, but hasn't been since at least 1988
	EXIT 48 Enon Donnellsville	Half Diamond	70 narrows from 6 lanes back to 4 just in time to bottleneck traffic trying to make it around Springfield. Go figure.
68 SOUTH Xenia		Cloverleaf	Go To 68
68 NORTH Urbana		Cloverleaf	Go To 68
EXIT 54 72 Springfield Cedarville		Modified Diamond
EXIT 59 41 Springfield South Charleston		Diamond
EXIT 62 40 Springfield		Modified Diamond	Business Route 70 is supposed to terminate at this point. This exit used to have those shields on its Big Green Signs back in the 70's, but they have vanished since then.