Interstate 375 Florida


Interstate 375 (North Bay Drive) is the northern freeway spur connecting I-275 with Downtown St. Petersburg. One-tenth of a mile shorter than its southern counterpart (I-175), I-375 is the shortest designated Interstate within Florida. State Road 592 runs along the entire length of North Bay Drive east to U.S. 19 Alternate and SR 595 (4th Avenue North).


Interstate 375 was built between 1977 and 1979 in two phases. The first completed section opened to traffic on January 17, 1978. The remaining portion of the 1.34-mile long freeway was completed in January 1979.1 The I-375 designation was formally added to the Interstate system in November 1982.2 A ramp stub at the west end alludes to a previously proposed connection with 20th Street North.

Route Information

  • West End
  • East End – 4th Avenue North
  • Mileage – 1.34
  • Cities – St. Petersburg
  • Junctions

Source: December 31, 2017 Interstate Route Log and Finders List

I-375 Annual Average Daily Traffic (AADT)

Vehicles per day Location
31,000 Between I-275 & MLK Jr. St. N.
22,500 Between MLK Jr. St. N. & 8th St. N.
9,900 Between 8th St. N. & 4th St. N.

Source: FDOT Florida Traffic Online (2017)

Highway Guides

West End – St. Petersburg

Perspective from Interstate 375 west
Interstate 375 west rises over 15th and 16th Streets North just ahead of the ramp split for Interstate 275. South Bay Drive defaults onto I-275 north toward Saint Petersburg-Clearwater International Airport (PIE) and the city of Tampa while a left side ramp connects with I-275 south. Photo taken 07/10/11.
A roadway stub appears along the ramp from Interstate 375 west to I-275 south for the unconstructed exit to 20th Street North. Photo taken 01/16/14.
Perspective from Interstate 275 south
Crossing 22nd Avenue North, I-275 continues one mile south to Interstate 375 (Exit 23A), the first of two freeways spurring east into Downtown St. Petersburg. Photo taken 05/28/14.
Interstate 375 east leaves I-275 south for the Uptown neighborhood near Downtown St. Petersburg. The freeway is also signed as the most direct route to both Sundial (shopping district) and The Pier, the city’s municipal marina. Photo taken 05/28/14.
Two lanes depart from the left side of Interstate 275 south for I-375 (South Bay Drive) east to Martin Luther King Jr. Street North and Florida 595 (4th Avenue North) ahead of 5th Street North. I-275 south next meets Interstate 175 (South Bay Drive) east. Photo taken 05/28/14.
Perspective from Interstate 275 north
Leaving the three way interchange (Exit 22) with Interstate 175 east to Tropicana Field, I-275 quickly approaches Interstate 375 east to The Pier. The freeway follows North Bay Drive to Florida 595 & U.S. 19 Alternate (4th Avenue North) north of Downtown. Photo taken 07/06/13.
Traffic from I-175 adds an auxiliary lane for I-375 east (Exit 23) and a third northbound lane for Interstate 275 north toward Pinellas Park and Tampa. Photo taken Photo taken 01/12/14.

East End US 19 Alternate Florida 595 / 4th Avenue North – location

Perspective from Interstate 375 east
Interstate 375 (North Bay Drive) navigates through an S-curve above Martin Luther King Jr. and 8th Streets North just ahead of the merge with SR 595 (4th Avenue North). Photo taken 08/24/13.
A pair of end shields precede the transition of I-375 (North Bay Drive) onto SR 595 (4th Avenue North) near Mirror Lake and the St Petersburg Shuffleboard Club. Photo taken 08/24/13.
Perspective from Florida 595 (5th Avenue North) west
U.S. 19 Alternate & SR 595 (5th Avenue North) stem west from U.S. 92 and SR 687 (4th Street North) four blocks to the westbound beginning of Interstate 375 (North Bay Drive). Photo taken 07/10/11.
Two lanes separate from 5th Avenue North westbound for Interstate 375. Succeeding ramps connect with I-375 just ahead of the directional T interchange with Interstat 275 north to Tampa and south to the Sunshine Skyway. Photo taken 07/10/11.


  1. Florida’s Interstates: A Half-Century of Progress. Florida Department of Transportation, web site.
  2. American Association of State Highway and Transportation Officials (AASHTO) Route Numbering Committee Meeting, November 19, 1982 (document).

Page updated August 22, 2014.