PHASE II: DETAILED CONCEPTUAL DESIGN

After compiling the 1st round of public feedback received from the public outreach sessions and online submissions, the corridor study team came up with 4 alternative designs for the corridor’s transportation network, a landscaping concept, and identified opportunities for redevelopment along the corridor.

ALTERNATIVES FOR CORRIDOR’S TRANSPORTATION NETWORK

In reviewing the public feedback, there was a general consensus regarding certain improvements the public would like to see happen along the corridor. These universal improvements were applied to all alternatives, which include:

  • Landscaping/Road Beautification including a Pocket Park at Church Street and South Cobb Drive
  • Intersection Improvements at Powder Springs Street and South Cobb Drive
  • Multi-Use Paths on Both Sides of South Cobb Drive
  • Sidewalks and Sharrows on Side Streets
  • Access Management along Corridor

ALTERNATIVE 1

In addition to the universal improvements listed above, Alternative 1 for South Cobb Drive’s transportation network proposes the following:

  • Adding a traffic signal at Bank Street and South Cobb Drive

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Benefits of Alternative 1:

This traffic light would replace the pedestrian HAWK signal that will be installed south of Plaza Drive later this year. Having a steady sequence of lights enables platoons of vehicles to proceed through a series of green lights without excessive delay. Longer distances between traffic lights breaks up platoons and reduces the efficiency of moving vehicles along a corridor. A full warrant analysis would be completed before a signal would be considered by the Georgia Department of Transportation.

ALTERNATIVE 2

In addition to the universal improvements listed above, Alternative 2 for South Cobb Drive’s transportation network proposes the following:

  • Adding bus pull-offs at transit stops and relocating bus stops to the far side of signalized intersections
  • Adding bike lanes on both sides of South Cobb Drive

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Benefits of Alternative 2:

  • Adding bus pull-offs at transit stops removes buses from the through movements, which reduces delay for drivers. Also, gaps are created for buses to reenter traffic when bus stops are located on the far side of signalized intersections.
  • Adding bike lanes to the corridor encourages bicycling as a means of transportation and promotes a more orderly flow of traffic. Bike lanes remove slower-moving bikes from vehicle lanes, which reduces delay for drivers.

ALTERNATIVE 3

In addition to the universal improvements listed above, Alternative 3 for South Cobb Drive’s transportation network proposes the following:

  • Adding bus pull-offs at transit stops and relocating bus stops to the far side of signalized intersections
  • Raised landscaped median along corridor
  • Bus queue jumping lanes at the intersection of Windy Hill Road and South Cobb Drive
  • A ThrU-Turn intersection at Windy Hill Road and South Cobb Drive

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Benefits of Alternative 3:

  • Adding bus pull-offs at transit stops removes buses from the through movements, which reduces delay for drivers. Also, gaps are created for buses to reenter traffic when bus stops are located on the far side of signalized intersections.
  • Raised medians provide pedestrian refuge and allows them to cross one direction of traffic at a time, which significantly reduces the complexity of crossing a wide high speed arterial such as South Cobb Drive. Studies from the Federal High Administration (FHWA) show that raised medians have been found to reduce motor vehicle crashes, reduce delay for motorists, and increase capacity of roadways.
  • Adding a bus queue jumping lane at Windy Hill Road and South Cobb Drive gives buses a “head start” over queued vehicles by allocating time to buses to move through intersection. Bus queue jump lanes reduce delay at intersections and improves the efficiency of transit.
  • A ThrU-Turn intersection removes left turns downstream through the intersection and guides them to complete a U-turn at a median opening (at an optional coordinated signal) and make a right turn onto the intersecting route. Some advantages of ThrU-turn intersections include reducing congestion, aiding in better progression along major routes, increasing capacity at the intersection, and fewer and more separate conflict points for vehicles.

ALTERNATIVE 4

In addition to the universal improvements listed above, Alternative 4 for South Cobb Drive’s transportation network proposes the following:

  • Raised landscaped median along corridor
  • Multi-Way Boulevard along Corridor
  • Adding a traffic signal at Bank Street and South Cobb Drive

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Benefits of Alternative 4:

  • Raised medians provide pedestrian refuge and allows them to cross one direction of traffic at a time, which significantly reduces the complexity of crossing a wide high speed arterial such as South Cobb Drive. Studies from the Federal High Administration (FHWA) show that raised medians have been found to reduce motor vehicle crashes, reduce delay for motorists, and increase capacity of roadways.
  • With a multi-way boulevard, South Cobb Drive would be transformed into a truly multi-modal roadway with safe and efficient options for all users (vehicles, transit, bicyclists, and pedestrians).
    • Multi-way Boulevard separates high vehicular volumes away from local traffic accessing developments along the corridor.
    • Barrier separation of the modes of travel creates a calming buffer that fosters a pedestrian and bicyclist friendly environment, which could stimulate redevelopment of abutting parcels. Moreover, South Cobb Drive has sufficient right-of-way to construct the Multi-Way Boulevard without the need for additional acquisition.

LANDSCAPING CONCEPT

Conceptual ideas for landscaping along South Cobb Drive were developed based on public feedback and potential transportation improvements detailed in the transportation network alternatives. Aerials of landscaping concepts for the corridor are shown with a raised median and without a raised median. Images are also included to show what the potential landscaping concepts would look like along the corridor.

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REDEVELOPMENT OPPORTUNITIES

The public was asked to provide feedback about the type of developments they would like to see more or less of along the corridor. Based on the received feedback, a land use analysis, and the incorporation of potential transportation improvements, key areas along the corridor were identified for potential redevelopment opportunities. Below is a map of the key areas along the corridor as well as images of the types of developments that were received from public feedback.

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Submit Comments Online (PHASE II)

 

PHASE I: INITIAL REQUEST FOR PUBLIC ENGAGEMENT AND FEEDBACK

The South Cobb Drive corridor study team attended and held a series of public involvement events to solicit public feedback about the type of improvements citizens would like to see along the corridor. Photos from some of the public outreach events and initial concepts drafted as a starting point of conversation for the public to provide feedback are shown below.

Public Outreach at Smyrna’s Jonquil Festival

INITIAL CONCEPTS FOR PUBLIC ENGAGEMENT AND FEEDBACK

RAISED MEDIAN CONCEPT DESIGN

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TYPICAL SECTION OF EXISTING AND PROPOSED RAISED MEDIAN CONCEPT

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