Effectiveness of lead-lag phasing on progression bandwidth

Zong Tian, Varun Mangal, Hongchao Liu

Research output: Contribution to journalArticlepeer-review

27 Scopus citations


Quantitative assessments are provided on two signal timing issues related to progression bandwidth maximization: the effectiveness of using lead-lag phasing and the effect of the number of signals on progression bandwidth. A computer program was developed to generate multiple signal system scenarios randomly and to provide maximum bandwidth solutions. The randomly generated signal system scenarios represented various signal systems likely to be seen in the real world. On the basis of these randomly generated system scenarios and their associated maximum bandwidth solutions, conclusions were drawn regarding the two issues. Lead-lag phasing had a significant advantage over the leadingleft-turn and lagging-left-turn phasing schemes to provide maximum bandwidth solutions. At any signal in a system, lead-lag phasing was used in more than 70% of the cases compared, with about 20% for leading-left-turn phasing and 10 % for lagging-left-turn phasing. The number of signals had a profound impact on bandwidth attainability, exhibiting a nonlinear decline in attainability and bandwidth with an increasing number of signals in a system.

Original languageEnglish
Pages (from-to)22-27
Number of pages6
JournalTransportation Research Record
Issue number2080
StatePublished - 2008


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