Retaining Walls with Frontage Roads This configuration, as shown in Figure 1.43 , shall be used where the construction of a grade separation would eliminate a parcel’s only access point to the roadway being grade-separated, necessitating a frontage road to restore and maintain access, and where available right-of-way is insufficient to accommodate earth slopes. For purposes of this section, right-of-way is considered insufficient where acquiring the ROW necessary for earth slopes would result in one or more of the following: ■ Demolition of an existing structure ■ Complete loss of direct access to a business or parcel ■ Creation of a nonconforming parking condition that cannot be mitigated within the remaining site ■ Elimination of required loading, service, or emergency access
Roadway ROW
400’
900’
B
Retaining Wall
Frontage Road
Railroad ROW
Border
# Lanes
B (ft)
Assumptions ■ Bridge height (ground to top of bridge deck): 35.92 feet ■ Superstructure depth: 65 inches ■ Approach roadway grade: 4% ■ Border width (utilities/maintenance/drainage): 10 feet ■ Buffer between face of retaining wall and frontage road: 8 feet
2 lanes 4 lanes 6 lanes
160 200 230
Figure 1.43: Grade Separation with Retaining Walls and Frontage Roads.
80
Fort Worth Master Transportation Plan | Master Roadway Network
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