## GREEN TRAFF

## C SOFTWARE

## Software decongesting cities

# Location: Hawthorne Boulevard

Number of intersections: 13

This case study is an example of Green Traffic Software tool applied to a real urban city arterial. Hawthorne Boulevard is one of major arterials throughout Los Angeles County. Here we consider its 13-intersections part, from Talisman Str to Lomita Blvd. The initial cycle length of 71 s allowed thе maximal sum bandwidth of 19 s only. We have chosen the cycle length of 96 s and got the sum bandwidth of 34 s.

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

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

Data source: Zhang C. et al. (2015) “AM-Band: An Asymmetrical Multu-Band model for arterial traffic signal coordination”, Transport Res. Part C (2015).

Output:

GTS provides the arterial portrait, showing all possible bidirectional timing plans with 1 sec resolution. In total, 379 timing plans are possible, 7 of them provide the maximal sum bandwidth of 34 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 the 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: 20 seconds

Outbound bandwidth: 14 seconds

Inbound bandwidth: 17 seconds

Outbound bandwidth: 17 seconds

Inbound bandwidth: 14 seconds

Outbound bandwidth: 20 seconds