Two Off Ramps

[DDuongY9EBQ]

Hello,

Beginner here... I have a project where the existing main road has two combined off ramps. One ramp (pointing south) will be for cars, and the other ramp (pointing east) will be for trucks. I created three separate corridors, but I am not certain sure how to combine all three.

Thank you,

[nkiakas]

Hi @DDuongY9EBQ

It is recommended to create a single corridor for your main road + 2 ramps

In general you have to follow the below steps (maybe you did already some of them)

1. Prepare a surface with the existing ground elevations (you have it, its in the screenshot) including the existing roads, because the main road ties-in with the existing road.
2. Prepare 3 Alignments, one for main road and one for each ramp.
3. Prepare 2 profiles for each alignment. One surface profile with existing ground and one layout profile. The layout profile will be your "Design Profile" and based on these 3 design profiles you will build your corridor. Be aware the tie-ins with existing roads and the crossing design profiles. Its very important this step. You will spend time in this step. This one will be the core of your design.
4. Prepare 2 offset alignments with their profiles for each one of the 3 above alignments.
5. Prepare the connected alignments needed to build your 3 branch intersection (main road +2 ramps). As i can see you may need at least 2 connected alignments. One between the ramps and one more between main road and the ramp for trucks
6. Create the assemblies with proper subassemblies needed.
7. Create the corridor by adding the horizontal and vertical baselines, regions and of course your offset+elevation+surface targets.

Please note the below

• What are you trying to do, it may be small as an area, but its not easy...
• All the above steps are just explanations. Each bullet has lot of work behind. If you did not it before, you find some assistance, usually from online videos, for each step from above workflow.
• I see in screenshot that the ramp for trucks (east) ties-in with the existing road (green dashed lines). So may need to create another intersection there.
• Spend time to understand first WHY have to do the above 7 steps and then HOW to do it and believe me it will worth the time.

Regards