Solutions from UBTSC

The basic interchange where traffic takes turns at the merge point on the above ground Terrasphere based on the Priority Rule. The Priority Rule:- You are at the merge point ahead of another vehicle, they give way to you. If they are there before you, you give way to them. Because you have to slow , but not stop, to negotiate the curves on the merge this is entirely reasonable and in the event that there is considerable traffic then merge in turn. By doing so with your exit off the Turnabout always clear you can enter and exit without stopping. The Glenmore Park model shows this most effectively.

If required, during construction , place a subterranean reservoir beneath the roadway to catch the rainwater coming off the Turnabout for recycling. The slip lanes when merging on any roadway should be of sufficient length to enable smoother merging into the flowing traffic.

 At a T intersection, a smaller version of both the Terrasphere and Terradome interchange as shown on the film can be constructed . Although a full size Terrasphere or Terradome could be constructed the smaller version will work just as efficiently ,effectively and cost less. It still uses the Priority Rule so you merge in turn. Again it can be constructed above or below the roadway surface, to become a Terrasphere or Terradome T Intersection. 

The model featured in the James Ruse Drive /Newbridge Road/ next to, Newbridge that crosses the Georges River ,shows unequivocally the benefit of a direct cross over the major road by a minor road where the minor road traffic is such that it affects the major road when a simple Turnabout can no longer cope with the volume of vehicles as they back up on the approach. The aim is to keep traffic moving ,flowing, irrespective of the amount of traffic on the road at any time.

A typical example . A major road with a minor road crossing. The first stage to improve traffic flow is to remove any existing restricting traffic lights or the standard roundabout with a basic Turnabout. Over time if the minor road traffic volumes increase so that traffic is stopped on the approach lanes to the Turnabout then the addition of the flyover cross resolves the problem.

If the roadways are turned into multi-lane roads or freeways then the ultimate crossing is required.

 The basic interchange built beneath the roadway utilising the same technique when merging as the Terrasphere. If constructed directly beneath the surface roadway with open mesh roadways, minimum lighting ,if any would be required and no ventilation extraction is required. Once again a reservoir beneath the Turnabout to catch rainwater for recycling is incorporated into the construct. It would even be possible to have the centre of the Terradome Turnabout reservoir open to the air and become an aqua-culture reservoir , or if capped a garden area. The light filtering through the open mesh roadways would in no way affect either.