VDOT guidelines of highway engineering:
Acceleration lanes must be short enough so that even the highest performance vehicles cannot reach the posted speed before merging in traffic.
Exit ramps can be placed on either the left hand, or right hand sides of the road at random, without any pattern or consistency to which side of the road they will be on. Signs denoting which side of the road the ramp will be on should only be placed less than a quarter mile from the actual ramp.
Lanes should randomly be added and removed from a road, especially in high traffic areas. It is recommended to turn a lane of travel into a deceleration lane for an off-ramp or a turn lane every so often to maximize confusion.
A four lane interstate highway, and itís traffic, along with another four lane interstate highway, and itís traffic can be combined onto a new 3 lane interstate highway, and the new highway will safely handle the traffic from both interstate highways without traffic jams
Major arteries through busy parts of towns do not need turn lanes. Instead, drivers can make left turns from the middle of the road, and stop the traffic behind them while they wait for the opposite side to clear.
Traffic signals should be timed so that when there is no traffic the light is green. Once a group of vehicles approach the intersection though, the signal needs to turn red.
Left turn lanes signals should be green as short as possible so that traffic will always fill up the turn lane, and spill out onto the straight through lanes.
Yellow signal lights need to be timed so that even the highest performance vehicle cannot stop behind the stop bar on an ice-free, dry road.
Posted speed limits should only be reduced on downhill runs. A Posted speed limit increase should always occur on uphill runs.