In this http://www.VideoFort.com Cinema 4D Model Road Tunnel tutorial Pt. 1, VideoFort Don shows how to model a Road Tunnel, based off of an online image. Start by loading the image into the front viewport, and onto a plane. This allows the model to be viewed in this perspective, without having to jump through other views. Than create a plane, hit C, to put it into an editable mode. As many of the objects and shapes are very simplistic and the sides are rather similar, select symmetry to mirror across the axis. Going to edge mode, and hitting extrude allows you to manipulate the edge, creating new walls and corners to play with. After creating this basic section of the tunnel, it is time to create the more detailed items within the tunnel, such as the rails and lights.
By creating multiple cross-sections this will allow you to create sections that can be changed. Bevel becomes a useful tool when creating edges or submerging areas, to create holes. Creating a cylinder will allow a basic shape for the start of your tunnel rails. Slimming the cylinder will give you a more realistic and ideal shape. Another way to create a rail is by using the Spline tool; this will also allow you to create a curved edge to your rail. After creating the rail, Clone the rail to create another one. Create a few poles, and place them equal distances apart. Create another cylinder to make a handrail to finish up the guardrail.
Creating a thin Rectangle object will allow the illusion of a light. Rotating to place against the roof will give the idea of light panels. Creating an attached end to connect the light panel to the wall, gives a more realistic look. After the light looks appropriate, we will move onto Pt. 2, creating texture to the Tunnel.