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I-670 highlighted in red
|Auxiliary route of I-70|
|Maintained by ODOT|
|Length||10.43 mi (16.79 km)|
|Existed||1975 (by FHWA), 1976 (by ODOT),, signed 1995, completed 2003–present|
|West end||I-70 in Columbus|
|I-71 in Columbus|
|East end||I-270 / US 62 near Gahanna|
Interstate 670 (I-670) is an Interstate Highway in the U.S. state of Ohio that passes through downtown Columbus, connecting I-70 west of downtown with I-270 and U.S. Route 62 (US 62) near the eastern suburb of Gahanna. I-670 provides access to John Glenn Columbus International Airport, and intersects State Route 315 (SR 315) and I-71 downtown. The section between SR 315 and I-71 is commonly referred to by locals as the "North Innerbelt"; the rest of the Innerbelt consists of SR 315 (west), I-70 (south), and I-71 (east and south).
In the late 1970s, the Ohio Department of Transportation was unable to complete the Spring-Sandusky interchange, linking both sections of the highway, due to budget shortfalls and environmental regulations, leaving I-670 the only uncompleted Interstate in Ohio. Two decades passed before work began on the last remaining section, bridging the gap between the two completed sections. Work on this section also included the High Street cap, a cut-and-cover bridge over the highway featuring shops and restaurants. I-670 was finally completed in 2003.
In June 2018, a $60 million construction project began on an active traffic management system known as SmartLane. The system, running between I-71 and I-270, re-purposed a shoulder lane and installed digital overhead signs that would inform motorists when the lane would open and the current speed limit to help reduce congestion. In addition, the interchange with I-270 was reconfigured. The management system opened to traffic in October 2019.
West of I-71, I-670 passes around both sides of Fort Hayes with two two-way roadways. The south roadway carries the eastbound main lanes and the westbound entrance ramps from I-71 north and SR 3 (Cleveland Avenue), while the north roadway carries the westbound main lanes and the eastbound entrance from US 23 north (4th Street) and High Street.
The entire route is in Franklin County.
|Columbus||0.00||0.00||I-70 west – Dayton||Western terminus; I-70 exit 96 eastbound|
|0.46||0.74||1A||US 33 west (Lower Scioto Greenway)||Westbound exit and eastbound entrance|
|0.95||1.53||1B||Grandview Avenue (CR 73)||Signed as exit 1 eastbound|
|2.24||3.60||2A||US 33 (Dublin Road) / SR 315 south||Eastbound exit and westbound entrance; connection to SR 315 ramps via traffic signals and (for NB-WB traffic) a short stretch of US 33|
|2.42||3.89||SR 315 south||Westbound exit and eastbound entrance|
|2.43||3.91||2B||SR 315 north|
|3.14||5.05||3||CR 578 (Neil Avenue) / Goodale Street||Goodale Street not signed eastbound|
|4||US 23 (Third Street / Fourth Street) / High Street – Convention Center||Signed as exits 4A (south) and 4B (north) eastbound, 4A (north) and 4B (south) westbound; High Street not signed eastbound|
|4.33||6.97||4C||SR 3 (Cleveland Avenue) / Leonard Avenue (CR 23)||Westbound exit is part of exit 5|
|5||Spring Street – Downtown||Westbound exit and eastbound entrance|
|I-71 – Cleveland, Cincinnati||Signed as exits 5A (south) and 5B (north) eastbound; I-71 exit 109A southbound, 109A-B northbound.|
|6.44||10.36||6||Leonard Avenue (CR 23)|
|7.56||12.17||7||US 62 west (5th Avenue)||West end of US 62 overlap|
|9||Stelzer Road (CR 177) / Johnstown Road (CR 377) / Cassady Avenue (CR 96) – Airport||Johnstown Road not signed westbound; Cassady Road not signed eastbound|
|10.43||16.79||10|| I-270 – Cleveland, Wheeling|
US 62 east – Gahanna
|Eastern terminus; east end of US 62 overlap; I-270 exit 35 northbound, 35A southbound; roadway continues as US 62|
|1.000 mi = 1.609 km; 1.000 km = 0.621 mi|
- Ohio Department of Transportation, , June 3, 2013
- "Columbus Chamber of Commerce: Worst Spots for Traffic Jams in Columbus". columbus.org. Retrieved July 18, 2019.[self-published source]
- "Spring-Sandusky". www.roadfan.com. Retrieved June 16, 2016.[self-published source]
- "Work begins on Ohio's first SmartLane on I-670 in Columbus". Ohio Department of Transportation. June 2018. Retrieved October 24, 2019.
- Roth, Claire (October 23, 2019). "ODOT Opens Ohio's First Smart Lane In Columbus". WOSU-FM. Retrieved October 24, 2019.