Design Schematic. The Design Schematic shall show, as a minimum:
3.1 Typical sections
3.2 Lane Lines and Arrows Indicating Number of Lanes
3.3 ROW limits: - Provide design cross-sections to verify ROW requirements - Show existing and proposed ROW limits - Show existing (if any) and proposed easements - Show the proposed toe of slope
3.4 New Bridge(s) Limits
3.5 Retaining Wall(s) Limits 3.6 Geometrics
Design Schematic. The Design Schematic shall show, as a minimum:
3.1. Typical sections, including bicycle and pedestrian facilities
3.2. Lane Lines and Arrows Indicating Number of Lanes, to include bicycle pedestrian elements
3.3. ROW limits: - Provide design cross-sections to verify ROW requirements - Show existing and proposed ROW limits - Show existing (if any) and proposed easements - Show the proposed toe of slope
3.4. Geometrics
3.5. Utility Conflicts/Adjustments (Location and Elevation Information)
3.6. Existing and Proposed Drainage Structures, offsite ponding areas
Design Schematic. The Engineer shall prepare a design schematic for the interim and ultimate design (both as determined from supporting studies and tasks) and traffic control staging for sequence of construction for the added capacity improvements of IH 35 from .5 mile South of IH 35 / US 59 to MM 13). Major added capacity elements include:
0. Schematic layout shall include the location of interchanges, mainlanes, grade separations, frontage roads and ramps.
2. Develop vertical and horizontal alignment of mainlanes, ramps and cross roads at proposed interchanges or grade separations. Frontage road alignment data need not be shown on the schematic; however, it should be developed in sufficient detail to determine ROW needs. The degree of horizontal curves and vertical curve data, including “K” values, shall also be shown for ease of checking.
3. For freeways, show the location and text of the proposed mainlane guide signs. Lane lines and arrows indicating the number of lanes shall also be shown. All signing shall be in conformance with the TMUTCD.
4. Show the tentative ROW limits.
5. Layout shall include the geometric (pavement cross slopes, lane and shoulder widths, slope rates for fills and cuts) of the typical sections of proposed highway mainlanes, ramps, frontage roads, bridges, and cross roads.
6. Indicate the current and projected traffic volumes as provided by the Traffic Engineering Study. DocuSign Envelope ID: EB684705-7EFE-459C-ACCD-BB3BEAE6EBD7
7. The control-of-access lines shall be shown on the proposed schematic.
8. Show the direction of traffic flow on all roadways.
9. Layout shall include the geometrics of speed change (acceleration, deceleration, climbing) lanes.
10. The schematic layout shall include basic information which is necessary for the proper review and evaluation including the items listed above and on the TxDOT checklist for schematic layout.
11. Upon approval of the schematic layout by Design Division (FHWA on Federal-aid projects), it shall be the basis for an exhibit at any required public hearing.
Design Schematic. Upon approval of the recommended alternative, the ENGINEER will perform digital mapping of the Project as shown in Exhibit 2 below. The corridor will have 1400-foot width (700 feet each side of centerline). Aerial mapping will use the previously acquired 5cm GSD imagery and helicopter LiDAR. Aerial photography and LiDAR will suitable for ASPRS Class I 1” = 50’ scale mapping specifications and to generate 1-foot contours. Aerial mapping photogrammetry will hold to 0.167-foot vertical RMSE on hard surfaces in well-defined areas and 0.33-foot vertical RMSE on soft surfaces. Aerial LiDAR will hold a 0.15-foot vertical RMSE on hard surfaces and 0.33-foot on soft surfaces.
1. Preliminary 3D LiDAR file in Power GeoPak V8i (SELECT series 4). Digital elevation model will be generated from LiDAR points and will not include breaklines.
2. 1 = 50’ scale 2D planimetrics of the entire project area, in Power GeoPak V8i (SELECT series 4)
