Fixed the tunnel rendering. requires network extension 2 mod in order for the tunnel display to work when using first person camera. It will display as a RHD road when "left hand traffic" option is being ticked, and will only show as a LHD road only when this option "left hand traffic" isn't ticked.

Under Road properties, I edit both ends of the road (the pedestrian side of the road).

Then at Lane properties, these are the props I swapped as follows in both props [pedestrians, none, -14.5] and [pedestrians, none, 14.5]:

Traffic Light 02 to Traffic Light Mirror 01
Traffic Light 01 to Traffic Light Mirror 02

Traffic Light Mirror 01 to Traffic Light 02
Traffic Light Mirror 02 to Traffic Light 01

I don't understand why it show twice but that was the default when I first took a look at the lane properties of this Vanilla six-lane avenue road asset, but at the same time under road properties in lanes, I swapped the direction of the traffic as the following props:

vehicle, car 1.5 (backward to forward)
vehicle, car -1.5 (forward to backward)
vehicle, car 7.5 (backward to forward)
vehicle, car -7.5 (forward to backward)
vehicle, car 4.5 (backward to forward)
vehicle, car -4.5 (forward to backward)