Curb ramps type 4B1

crdr-ele-crb-rmp-4b1-01.mp4 2:57

• Alignments are already created in the data set. In the same way as scenario 1 (Type 2 Curb Ramps), the curb ramp landing (triangular 1.5% area) needs to be created in the roadway corridor file.
• Unlike scenario 1, the ramp alignment is not created in the curb ramp corridor file. Instead, it needs to be created in the roadway corridor file. It is put in the roadway corridor file to act as a target for the curb ramp setup corridor because there is not a crossing sidewalk alignment to act as this target.

crdr-ele-crb-rmp-4b1-02.mp4 3:22

1. Add an additional baseline to the applicable curb ramp setup corridor. This will be a duplicate baseline that will hold data for the opposite side of the roadway as the first baseline.
2. Use the CurbRamp-Setup-L (or R) assembly for the station range of the curb ramps.
3. Target the Crdr-Setup-BOC surface, CG-Back alignment, landing alignment, and ramp alignments

crdr-ele-crb-rmp-4b1-03.mp4 3:53

1. Create a surface profile for the ramp alignment. The surface profile is on the Crdr-SetupCurbRamps surface.
2. Place an intersection object on the inside sidewalk alignment at the top of the curb ramp alignment. The priority 1 alignment/profile is the ramp alignment and surface profile.

Save DWG and Create Data Shortcuts

1. Save the DWG file.
2. Create Data Shortcuts for the following objects: (already done for you in the training data set)
3. Alignments
4. Curb Ramp Alignment(s)
5. Curb Ramp Lower Landing Alignment(s)
6. Close the file

crdr-ele-crb-rmp-4b1-04.mp4 5:10

1. Create the curb ramp taper alignments in the Crdr-CurbRamps dwg file.
2. The inside taper alignment starts at the back of curb, continues to the top of the ramp, and terminates on the sidewalk at the end of the radius.
3. The outside taper alignment starts at the back of curb and terminates at the top of the ramp.

crdr-ele-crb-rmp-4b1-05.mp4 7:04

1. Depending on the design, a few extra steps may be needed to blend the slopes of the two roadways in the curb ramp area.
2. In the training example, the roadway without a sidewalk has two slopes behind the curb and gutter. A 2 ft width at 4% and then the remaining width is 6:1 to match into existing ground.

3. To blend this to the single slope configuration behind the sidewalk, first create an alignment along the edge of the 4% slope on the adjacent roadway. As long as the alignment extends beyond the area where the blending will occur, the length does not matter.

4. Create the blending alignment. The blending alignment begins somewhere along the profile match alignment (where you want to match into the adjacent roadway slopes). It follows the profile match alignment and connects to the Outside Taper alignment. Then, it follows the Outside Taper alignment up the ramp. It terminates on the outside sidewalk alignment at the end of the radius.

crdr-ele-crb-rmp-4b1-06.mp4 2:29

• Many of the same surface profiles created in scenario 1 are also needed in this example. Create surface profiles on the Curb Ramp Setup Surface for the following alignments:
  • Landing Alignment
  • Ramp Alignment
  • Inside Sidewalk Alignment
  • Outside Sidewalk Alignment
• Create surface profiles on the Ultimate Surface for the following alignments
  • Inside Sidewalk Alignment
  • Outside Sidewalk Alignment
  • Profile Match Alignment
  • Back of Curb and Gutter Alignment

crdr-ele-crb-rmp-4b1-07.mp4 3:05

Create Profile Views

1. Create Profile Views for the following alignments
   • Ramp Alignment
   • Blend Alignment
   • Inside Taper Alignment
   • Outside Taper Alignment

Create Proposed Curb Ramp Profiles

1. Create an arbitrary starting profile for the following alignments. Make the profiles begin and end past the extents of the alignment. The elevations do not matter because intersection objects will control their elevation in a later step.
   • Inside Taper Alignment
   • Outside Taper Alignment
   • Blend Alignment

crdr-ele-crb-rmp-4b1-08.mp4 7:08

1. Create the following intersections objects.

2. If the initial profiles created earlier were put somewhere near elevation 0, the profile views may appear very tall. The beginning and ending tangents for these profiles need to be deleted. Select the profile and use the Delete Entity command to delete these two tangent sections.

crdr-ele-crb-rmp-4b1-09.mp4 8:21

1. Add the following alignments/profiles to the curb ramp corridor as baselines
   • Landing Alignment/Crdr-Setup-CurbRamp Surface Profile
   • Ramp Alignment/Crdr-Setup-CurbRamp Surface Profile
   • Inside Taper Alignment/Proposed Profile
   • Outside Taper Alignment/Proposed Profile (The region limits for the Outside Taper Baseline are from the back of curb to the blend alignment.)
   • Blend Alignment/Proposed Profile
2. The remaining steps for creating the hide boundary and grading behind the sidewalk are the same as previous sections.