Interstate 12
From Wikipedia, the free encyclopedia
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| Interstate 12 Main route of the Interstate Highway System |
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| Length: | 85.59 mi (137.74 km) |
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| West end: |  I-10 in Baton Rouge, LA |
| Major junctions: |
 I-55 near Hammond, LA
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| East end: |  I-10 and I-59 near Slidell, LA |
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Interstate 12 (abbreviated I-12) is an intrastate interstate highway located entirely within the state of Louisiana, United States. It starts in Baton Rouge, Louisiana (map) where it branches off of Interstate 10, travels along the North shore of Lake Pontchartrain, and ends at the intersection of Interstate 10 and Interstate 59 near Slidell, Louisiana (map). In 1993, the state legislature renamed Interstate 12 as the "Republic of West Florida Parkway". In 2003, signs identifying the highway's official name and bearing the flag of the Republic of West Florida were erected by the Louisiana Department of Transportation and Development in order to highlight the unique history of Louisiana's Florida Parishes. I-12 is six lanes from its western terminius until Exit 7 (O'Neil Lane) at which point it becomes a 4 lane highway all the way to the eastern terminus.
The highway should probably have been designated as a three digit interstate as it is really an I-10 bypass and access road and terminates at the transcontinental highway at both ends. It is relatively short for a mainline route, as well, at only 85 miles - while Interstate 19 (63 mi.), Interstate 66 (76 mi.), Interstate 86 (west) (63 mi.), Interstate 97 (18 mi.) and Interstate 99 (58 mi.) are shorter, none of these have two termini with the same route, much less within the same state as well. Compare to the 73.5 mile Interstate 295 in New Jersey and Delaware, which bypasses Interstate 95 or the 72.8 mile Interstate 405 in California, which (arguably) bypasses Interstate 5. A suitable numbering would have been 810 (because 210 and 610 are already existant, and 410 was once proposed for the New Orleans metro area).
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[edit] Major cities
Bolded cities are officially-designated control cities for signs.
[edit] Intersections with other interstates
- Interstate 10 in Baton Rouge, Louisiana ([1])
- Interstate 55 in Hammond, Louisiana ([2])
- Interstate 10 and Interstate 59 near Slidell, Louisiana ([3])
[edit] List of Exits
The following is a list of exits along Interstate 12.
| Exit Number |
Mile | Destination | Map | Notes | |
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| Highways and/or Control Cities | Municipality | ||||
| Western Terminus - Interstate 10 - Baton Rouge, Louisiana |
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| Interstate 10 West - Baton Rouge |
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| 1A | Interstate 10 East - New Orleans |
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| 1B | Louisiana Highway 3064 - Essen Lane | Eastbound exit, westbound entrance | |||
| 1B | Louisiana Highway 1068 To Louisiana Highway 73 - Jefferson Hwy, Drusilla Lane | Westbound exit, eastbound entrance | |||
| 2A |  US 61 South - Airline Highway |
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| 2B | US 61 North - Airline Highway |
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| 4 | Sherwood Forest Blvd. | ||||
| 6 | Millerville Road | ||||
| 7 | O'Neal Lane | ||||
| East Baton Rouge Parish / Livingston Parish Line (Mile 9) | |||||
| 10 | Louisiana Highway 3002 - Denham Springs | ||||
| Louisiana Highway 1026 - Juban Road | |||||
| 15 | Louisiana Highway 447 Port Vincent / Walker | ||||
| 19 | Colyell / Satsuma | ||||
| 22 | Louisiana Highway 63 - Frost / Livingston | ||||
| 29 | Louisiana Highway 441 - Holden | ||||
| 32 | Louisiana Highway 43 - Springfield / Albany | ||||
| Livingston Parish / Tangipahoa Parish Line (Mile 34) | |||||
| 35 | Pumpkin Center Road - Baptist | ||||
| 38A | Interstate 55 South - New Orleans |
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| 38B | Interstate 55 North - Jackson |
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| 40 |  US 51 Business - Ponchatoula / Hammond |
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| 43 | Louisiana Highway 3158 - Airport Road | ||||
| 47 | Louisiana Highway 445 - Robert | ||||
| Tangipahoa Parish / St. Tammany Parish Line (Mile 53) | |||||
| 57 | Louisiana Highway 1077 - Goodbee | ||||
| 59 | Louisiana Highway 21 - Madisonville / Covington | ||||
| 63A |  US 190 East - Mandeville |
Access to Lake Pontchartrain Causeway | |||
| 63B | US 190 West - Covington |
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| 65 | Louisiana Highway 59 - Mandeville / Abita Springs | ||||
| 74 | Louisiana Highway 434 - Lacombe / St. Tammany | ||||
| 80 | Northshore Blvd./Airport Road | ||||
| 83 |  US 11 - Slidell / Pearl River |
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| 85A | Interstate 10 West - New Orleans |
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| 85B | Interstate 59 North - Hattiesburg |
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| 85C | Interstate 10 East - Bay St. Louis |
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| Eastern Terminus - Interstate 10 / Interstate 59 - Slidell, Louisiana |
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[edit] Notes
- With major damage to the I-10 Twin Span Bridge across Lake Pontchartrain from Hurricane Katrina, I-12 was temporarily functioning as I-10. On October 14, 2005 at 3:00 PM, the eastbound span of I-10 over Lake Pontchartrain was reopened to two way traffic. The westbound I-10 Twin Span reopened on January 6, 2006 at 6:00 AM, with speed, weight and size restrictions, relieving I-12 of much of the congestion that was clogging it from the Lake Ponchartrain Causeway to the junction with I-10 and I-59.
- The state Department of Transportation is currently constructing a new interchange at Juban Road, just east of Denham Springs. Construction is slated to be complete in late 2007 or early 2008. [4]
| Main Interstate Highways (multiples of 5 in pink) |  |
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| 4 | 5 | 8 | 10 | 12 | 15 | 16 | 17 | 19 | 20 | 22 | 24 | 25 | 26 | 27 | 29 | 30 |
| 35 | 37 | 39 | 40 | 43 | 44 | 45 | 49 | 55 | 57 | 59 | 64 | 65 | 66 | 66 (W) | 68 | |
| 69 | 70 | 71 | 72 | 73 | 74 | 75 | 76 (W) | 76 (E) | 77 | 78 | 79 | 80 | 81 | 82 | ||
| 83 | 84 (W) | 84 (E) | 85 | 86 (W) | 86 (E) | 87 | 88 (W) | 88 (E) | 89 | 90 | ||||||
| 91 | 93 | 94 | 95 | 96 | 97 | 99 | (238) | H-1 | H-2 | H-3 | ||||||
| Unsigned | A-1 | A-2 | A-3 | A-4 | PRI-1 | PRI-2 | PRI-3 | |||||||||
| Lists | Main - Auxiliary - Suffixed - Business - Proposed - Unsigned Gaps - Intrastate - Interstate standards - Replaced |
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