Tunnel Blocks

Use this dialog to create tunnel blocks and specify where the blocks should be constructed along the road alignment.

A tunnel block describes a small section of the tunnel that does not follow the standard tunnel profile, such as an adjustment at an exit ramp or a roof niche that needs to be repeated multiple times along the road alignment. Tunnel blocks can be used with manual, parametric, or combined methods.

Create new tunnel blocks in the left window by pointing and left-clicking in the Block Name column. Enter the name of the block in the field. You define the block itself in the corresponding edit dialog. Tunnel blocks are described in the same way as manual tunnels, but the contours are entered relative to a reference profile. Right-click and select Edit... to define the block.

With Copy/Paste, you can copy tunnel blocks, including between SFI files.

In the right window, specify where the blocks should be constructed along the road alignment by entering the profile number and block name. You can enter the values manually or copy them from Excel.

Tunnel blocks are constructed in the cross-sections according to the block description. It is recommended to regenerate profiles before building surfaces to ensure you have profiles for all parameter changes along the road alignment. Note that during profile generation, a profile is created 1 mm before the start profile and 1 mm after the end profile of the block. This provides full flexibility in the tunnel block. The tunnel block is a separate object and can have a different number of surfaces compared to the standard tunnel profile along the road alignment.

In this example, the block starts at profile 7388 and ends at profile 7412.