CCG2 Project Scope_Section 12_Roadway_IR Draft2.docxCCG2 Project Scope_Section 12_Roadway_IR Draft.docx

12  ROADWAY

The Developer shall design and construct all roadways, parking lots, and associated roadway items including earthwork, pavements, curbs, medians, islands, barriers, fence, incidentals and other roadside items. This Section 12 describes the roadway and parking lot requirements for the Project, including the governing regulations and Project-specific requirements. This Section 12 also defines the approximate Project Limits and Work Limits as well as the limits for removal of existing roadway and structure.

12.1  GOVERNING REGULATIONS

The governing regulations for Department and local facilities are indicated in Section 12.1.1 and 12.1.2. The Developer has the ability to modify the design of the Project with regard to adjustments to the physical design and/or function within the limitations provided in Section 1.6 (Basic Configuration). Table 12-1 indicates changes to the Department Location and Design Manual (L&D), Volume 1 that govern this Project.

Table 121: Location and Design, Volume 1 Revisions

Section / Subject / Revised Language /
105.1 / Design Exceptions / The designer should shall call attention to any substandard design feature as soon as possible…
105.1 / Design Exceptions / Design exceptions should shall be stand alone documents and should shall include attachments for clarity when needed.
201.3 / Intersection Sight Distance / If intersections sight distance cannot be provided due to environmental or right-of-way constraints, then as a minimum, the stopping sight distance for vehicles on the major road should shall be provided.
201.3.1.1 / Intersection Sight Distance / In making this determination, it should shall be assumed that the driver’s eye is 3.5 ft. above the roadway surface and the object to be seen is 3.5 ft. above the surface of the roadway.
301.1.3 / Traveled Way Widening on Highway Curves / Additional widening may be necessary shall be provided on curves depending on the design speed, curvature and traveled way width. The Traveled Way Widening values in Figure 301-5c are based on the WB-62 [WB-19] vehicle, and are applicable to either one-way or two-way, two-lane traveled ways, and other similar type facilities. A WB-62 [WB-19] design vehicle is to be used on state maintained roadways. The design vehicle for other than state maintained roadways shall be determined by the maintaining authority. Note that widening less than 2.0 ft. is not required.
Curve widening should shall be placed on the inside edge of the curve. Where spirals are used, the widening should shall begin at the TS and reach maximum width at the SC. On alignments without spirals, the widening should shall be developed over the same distance as the superelevation transition. See Section 202.4 and Figure 301-5a. The transition ends should shall be rounded to avoid an angular break at the travel way edge and intermediate points should shall be widened proportionately. The longitudinal center joint and the centerline marking should shall be placed equidistant from the traveled way edges.
301.1.4 / Pavement Tapers / Where traveled way widths decrease, the length of transition should shall be calculated using the following:
301.2.3.1 / Right Turn Lane Shoulder Width / The normal mainline shoulder width should shall still be maintained in advance of the diverging taper for the turn lane. The transition between the mainline shoulder width and the reduced shoulder width should shall take place during the span of the right turn taper.
301.2.5 / Lateral Clearance / As a minimum, the designer should shall provide a shy line offset of at least 4 ft.
304.4.2 / U-Turn Median Openings / U-turn crossings should shall not be constructed in barrier-type medians.
305.3.1 / Position of Curb – Urban Areas w/ less than 50 mph speed / Therefore, all curbs should shall be offset at least 1 foot and preferably 2 ft. from the edge of the traffic lane.
305.3.2 / Position of Curb – Urban and Rural High Speed Areas / When it is necessary to use curbs on roads where the design speed is 50 mph or greater, they should shall not be closer to the traffic than 4 ft. or the edge of the treated shoulder, whichever is greater and their height should shall not exceed 4 inches.
305.4.2 / Curbed to Uncurbed Transitions / When an urban type section with curbs at the edge of traveled way changes to a rural type section without curbs, the curb should shall be transitioned laterally at a 4:1 (longitudinal: lateral) rate to the outside edge of the treated shoulder or 3 ft., whichever is greater.
305.4.3 / Curbed Approach to Uncurbed Mainline / When a curbed side road intersects a mainline that is not curbed, the curb should shall be terminated no closer to the mainline edge of traveled way than 8 ft. or the edge of the treated shoulder, whichever is greater.
306.2.5 / Sidewalk – Cross Slope / Sidewalks should shall be constructed with a maximum cross slope of 2 percent.
306.3.4 / Curb Ramp Types / In all cases curb ramps should shall be located entirely within the marked crosswalks (where they exist).
306.3.4 / Curb Ramp Types / Drainage grates or inlets should shall not be located within the crosswalk area, where wheelchair casters or canes tips may be caught.
306.3.5 / Detectable Warnings / Truncated domes should shall be used at the following locations:
307.5.1 / Interchange Grading – Cross Roads / At a road crossing within an interchange area, bridge spill-through slopes should shall be 2:1, unless otherwise required by structure design. They should shall be flattened to 3:1 or flatter in each corner cone and maintained at 3:1 or flatter if within the interior of an interchange. Elsewhere in interchange interiors, fill slopes should shall not exceed 3:1.
307.5.2 / Interchange Grading – Ramps / Roadside design for ramps should shall be based on the mainline grading concept.
401.1 / Intersection Locations / The alignment and grade on the mainline roadway should shall, as a minimum, provide stopping sight distance as discussed in Section 201.2.
401.4.1 / Intersection Area / The pavement surface within this "intersection area" should shall be visible to drivers within the limits of the minimum stopping sight distance shown on Figure 201-1.
401.4.1 / Intersection Area / For this reason, edge of traveled way profiles should shall be plotted and graphically graded to provide a smooth profile.
401.4.3 / Profile at Stop Intersections / If these grade breaks are exceeded, they should shall be treated according to Note 3 on Figure 401-3.
502.2.2 / Approaches to the Structure – Sight Distance / Sight distance on the roadways through an interchange should shall be at a minimum the required stopping sight distance and preferably should be Decision Sight Distance (Figure 201-6), particularly along entrances and exits.
601.1.2 / Roadside Barrier Warrants – Slopes / Figure 601-1 should shall be used to determine roadside barrier warrants for embankments.
602.1.1 / Roadside protection – Location/Offset / Although variations from these offsets may occur as a result of reduced graded shoulder width, the face of barrier should shall not be located closer than 4 ft. to the edge of the traveled lane.
602.1.5.1 / Guardrail with Curb (High Speed) / The curb height should shall be limited to 4 inches or less when used in conjunction with guardrail on high speed roadways.
603.1.1 / Steel Beam Guardrail Posts / For guardrail installations to perform properly during an impact, adequate soil support must be provided for the posts in the guardrail run. To ensure this support is provided, 9.0 ft. [2.75 m] long posts should shall be specified at locations where the distance from the face of the barrier to the slope break point is less than 2.0 ft.
802.2.9 / Location of High Volume Drives / A new driveway should shall not be located where it will create an offset intersection opposite an existing street, highway, or major commercial driveway.

12.1.1  Department Facilities

In the event of a conflict among the standards listed in Section 1.11 (Governing Regulations)Error! Reference source not found. related to roadways, the Department’s standards shall take precedence. The design of the mainline and ramps shall be according to the manuals and guidelines in Section 1.11 (Governing Regulations), with the exception of approved design exceptions. Approved design exceptions for known substandard design features are available in the appendices. The Project shall meet the criteria established in the design exception documents.

The Interchange Justification Study (IJS) was approved as a basis for the design of this Project. The IJS is available in Appendix TC-06 (Interchange Justification Study (IJS)). It contains the operational aspects and the storage requirements of each intersection.

12.1.2  Local Facilities

The Developer shall construct items on local roads presented in Table 12-2 according to the applicable local government agency-issued standards. Section 1.6 (Design Designations and Maintaining Agencies) lists the roadways and their maintaining agencies. If the local government agency does not have an appropriate Standard Construction Drawing, the Developer shall use ODOT SCDs.

12.2  PROJECT REQUIREMENTS

12.2.1  Work Limits and Project Limits

Project Limits define the minimum limits of full-depth pavement replacement or new pavement, as applicable. Work Limits define the extreme minimum limits of the Developer’s responsibility, encompassing the Project Limits and including all temporary and incidental construction, except temporary traffic control devices. See Appendix PA-02 (Pavement Limits) for a plan view of the minimum paving limits. The Developer shall construct the roadways within the Work Limits in accordance with Table 12-2 and in accordance with Appendix PA-02 (Pavement Limits).

Table 122 Minimum Work Limits

Alignment / Limits /
Proposed Mainline I-71 northbound / STA. 1963+50 to STA. 1980+95
Proposed Mainline I-71 southbound / STA. 1963+50 to STA. 1980+26
Proposed Mainline I-90 eastbound / STA. 1980+95 (Match to I-71 northbound) to STA. 2050+25 (Match to I-90 eastbound Interim Condition)
Mainline I-90 westbound Interim Condition / STA. 300+48 to STA. 306+96
Mainline I-90 eastbound Interim Condition / STA. 500+00 to STA. 510+45
Ramp B1 (I-90 eastbound to I-90 eastbound) / STA. 29+22 to STA. 34+15
Ramp B2 / Fairfield Avenue to I-90 eastbound
Ramp B3 / I-90 eastbound to Ontario Street northbound
Ramp B4 / I-90 eastbound to East 9th Street southbound
Ramp B5 / I-90 eastbound to East 9th Street northbound
Ramp from East 14th Street to I-77 southbound / East 14th Street to I-77 southbound
Fairfield Avenue / STA 16+58 to STA 20+40
West 14th Street northbound / STA. 0+00 to STA. 7+84
West 14th Street southbound / STA. 100+00 to STA. 105+ 44
Canal Road / STA 126+75 to STA 131+39
STA 32+00 to STA 33+12
Ontario Street / STA 18+23 to STA. 28+90
East 9th Street / Intersection with Carnegie Avenue, continuing southwest to the East 9th St./Broadway Ave. intersection
Orange Avenue / STA. 10+00 to STA. 18+23
Towpath Trail / STA. 300+56 to STA. 312+01

12.2.2  Roadway Design

In addition to the governing regulations per Section 12.1.1 and Section 12.1.2, the Developer shall comply with the following requirements:

  1. Ramp grades shall not exceed 5 percent, except for the realigned East 14th Street to I-77 southbound ramp, which shall not exceed 7.2 percent.
  2. Vertical curve low points are not permitted within any bridge limits of the Project. Flanking inlets are not allowed on the structure.
  3. The beginning of a ramp diverge shall be located a minimum of 100 feet past the return radius of the intersecting street.
  4. Minimum horizontal clearances:

·  For the Towpath Trail, the horizontal clearance, measured from the edge of the paved path to the face of any vertical obstruction, shall be at least 3 feet.

  1. An offset of at least 2 feet shall be provided from the back of walks to the slope break point of any back slope steeper than 6:1 (H:V).
  2. For Stop Condition crossroad profiles as shown in L&D Volume 1, Figures 401-2 and 401-3, the maximum grade in the intersection area shall not exceed 3 percent. For intersections with crosswalks, the maximum grade shall be 2 percent.
  3. The minimum grade for the I-90 Viaduct Structure shall be 0.5 percent.
  4. ADA-compliant curb ramps shall be provided at all corners of intersections within the Work Project Limits.
  5. A 23-foot vertical clearance window (as measured from the top of rail) shall be maintained for existing GCRTA railroad lines. The 23-foot vertical clearance shall be measured from the highest top of the rail at any given cross-section. The vertical clearance window limits shall extend horizontally between the faces of the existing retaining walls flanking the existing GCRTA railroad lines.
  6. The Developer shall design and construct guardrail, concrete barrier, and other roadside design features (including end treatments) per L&D Volume 1, Section 600, except as designated below:

·  The Developer shall provide Guardrail, Type MGS for all new guardrail locations. Bridge terminal assemblies and other appurtenances as required shall be compatible with Guardrail, Type MGS. The Guardrail, Type MGS shall be transitioned to meet the existing guardrail type at tie-in locations where existing guardrail is present. Transition from Guardrail, Type MGS to existing guardrail shall be a minimum of 50 feet.

·  The Developer shall provide Texas Department of Transportation, Type T80HT traffic rail in accordance with Appendix ST-03 (Texas Type HT Drawings), along the left and right side of the approach slabs from Station 2002+13 to Station 2002+63, from Station 2045+98 to Station 2046+48, and along both sides of the approach slab for Ramp B2 from Station 204+74 to Station 204+99.