Examples of how to set road levels at interchanges

Example 1

Illustrates how road sections are divided up and how levels A and B are set (see section 3.3.2.5. Level (A) and Level B)). This example shows a "butterfly" interchange (at the intersection of the M-4 and R-140 highways).

Example 2

Illustrates how road sections are divided up and how levels A and B are set at a multi-level interchange (in the Antwerp metropolitan area).

Example 1

Illustrates how road sections are divided up and how levels A and B are set (see section 3.3.2.5. Level (A) and Level B)) at a "butterfly" interchange (the intersection of the M-4 and P-140 highways). The drawings illustrate the stages involved in mapping the road sections of level A and Level B along the highways and interchange exit ramps.

Figure 1. Photo of the interchange with a map of the road network


Figure 2. Road network map. The arrows show the traffic direction and the drawing direction (A → B) ; the green lines indicate the bridge abutment where the M-4 highway intersects with the P-140


Figure 3. Mapping levels A and B of P-140 highway sections (the brown circles represent road intersections); all levels equal zero


Figure 4. Mapping levels A and B of P-140 and M-4 exit ramps (the brown circles represent road intersections); all levels equal zero


Figure 5. Mapping levels A and B of M-4 highway sections (the brown circles represent road intersections). Note that now the values of levels A and B have gone from zero to one as the highway passes over the bridge.


Example 2

Illustrates how road sections are divided up and how levels A and B are set (see section 3.3.2.5. Level (A) and Level B)) at a multi-level interchange (in the Antwerp metropolitan area). The drawings illustrate the stages involved in mapping the road sections of level A and Level B.

Figure 6. Interchange photograph


Figure 7. Road network map. The small brown circles depict road intersections (the circles at the edges of the drawing do not correspond to actual intersections in the road network, they are just there to define the scope of the diagram). Arrows correspond to road sections. The arrows indicate the traffic direction and the drawing direction (A → B). The green lines indicate the road sections that pass over bridges and overpasses


Figure 8. Mapping levels A and B of regional roads (in blue). All levels equal zero


Figure 9. Mapping levels A and B of district roads (in green). All levels equal zero


Figure 10. Mapping levels A and B for several exit ramps (dark blue). Note that the values of level A and B change over the bridges and overpasses


Figure 11. Mapping levels A and B for several exit ramps (purple). Note that the values of level A and B change over the bridges and overpasses


Figure 12. Photo of the interchange showing the road network map and infrastructure