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Location: Viale Regina Elena —  Viale Regina Margherita — Viale Liegi, Rome, Italy

Number of intersections: 7

This case study is an example of Green Traffic Software tool applied to a real urban city arterial. This arterial consists of several streets, running diagonally through northeastern Rome. It is 2600 m long and contains 7 intersections, none of which have left turns.

For the given set of phase splits in all arterial intersections, GTS provides multiple coordination schemes.

Arterial map

Maps data: Google, © 2023

Input arterial data:

  Number of traffic lights

  Distances between them


  Recommended vehicle velocity


  Split phasing


  Cycle lengths and the desired   common cycle length

Arterial input data

Data source: N. Papola  and G.Fusco (1998) “Maximal bandwidth problems: a new algorithm based on the properties of the periodicity of the system”, Transp. Res.-B, Vol.32, No.4, pp.277-288.

Arterial Portrait


GTS provides the arterial portrait, showing all possible bidirectional timing plans with 1 sec resolution. In total, 409 timing plans are possible, 17 of them provide the maximal sum bandwidth of 30 seconds.

Each green asterisk leads to a particular timing plan: offsets and phase sequences ("orders") are shown together with the time-space diagram. The dark green asterisks mark the bandwidths pairs with maximal sum. The blue circles mark the bandwidth pairs that are impossible in this arterial.

Three arterial timing plans below correspond to the bandwidth pairs marked by green squares in AP.

Inbound and outbound bandwidths are indicated in green and blue, correspondingly.

The inbound direction in the diagrams is top-down, the outbound one is the opposite.

Inbound bandwidth: 22 seconds

Outbound bandwidth: 8 seconds

Time-space diagram

Inbound bandwidth: 15 seconds

Outbound bandwidth: 15 seconds

Time-space diagram

Inbound bandwidth: 8 seconds

Outbound bandwidth: 22 seconds

Time-space diagram
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