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- Despite problems with the available data and their measurement, it is concluded that – with the caveats of either pre‐existing congestion in the case of capacity increases or no spare capacity in the case of capacity decreases – the weight of evidence indicates that induced and suppressed traffic are indeed real phenomena.
People also ask
Does increased road capacity cause 'induced' and'suppressed' traffic?
When do induced and suppressed traffic occur?
Are induced and suppressed traffic real phenomena?
Does induced road traffic affect capacity change?
How does road capacity affect traffic?
Is there a relationship between traffic levels and road capacity?
- There are a number of areas that would benefit from further work:
- 3 LITERATURE REVIEW METHODOLOGY
- 3.1 SEARCH METHODOLOGY
- SYSTEMATIC LITERATURE SEARCH
- A.3 GROWTH OVER TIME AND SUPPRESSED DEMAND
- SEARCH PROTOCOL
- B.1 SEARCH STRATEGIES
- SEARCH STRATEGY 1
- SEARCH STRATEGY 2
Case study evidence is limited. Although there are major difficulties in designing a study to collect robust data (Rohr et al, 2012), it would be useful to be able to generalise more from specific case study examples to different types of road improvements. These could be categorised by scheme type but also by area type and geographical scale. More...
This chapter sets out the literature review methodology used to gather evidence on the scale of induced travel as a result of road infrastructure changes.
3.1.1. A two stage approach was used to identify a broad range of relevant literature for the evidence review. First we conducted a systematic search of academic databases for literature published in peer-reviewed journals, conference papers and work undertaken by universities and other institutions, including the DfT. While this search methodology...
3.1.2. A rapid evidence assessment (REA) was used for the literature search. This type of review aims to be a comprehensive, systematic and critical assessment of the scope and quality of available published evidence. REAs follow a similar structure to systematic literature reviews, as outlined in the Government Social Research Network Guidance, in...
Suppressed demand and induced traffic are effectively two sides of the same coin. If prices fall, the demand for a good increases (this is the induced traffic). If prices rise the demand for a good decreases (this is the suppressed traffic). That is induced traffic occurs when the generalised cost for travel decreases. If the generalised cost for t...
This appendix contains the search protocol used in the systematic literature search undertaken as part of the REA of the evidence on induced travel demand to inform the development of the Road Investment Strategy, which focuses on major road schemes in the UK.
We used two strategies. The first included broad terms to capture as much relevant literature as possible. It includes three separate searches. These covered terms related to induced travel, terms related to generated traffic (often used as a synonym for induced travel but is also used in other contexts), and terms related to ex-post studies of ro...
Induced travel OR induced traffic OR induced demand Generated traffic OR traffic generation Ex-post AND (road OR transport OR travel) An additional search was subsequently run to ensure all induced demand terms were captured, as follows Induced vehicle travel OR induced vehicle demand OR induced motor vehicle travel OR induced motor vehicle deman...
(Vehicle miles travelled OR VMT OR vehicle-kilometres travelled OR VKT OR traffic volume) AND (Road investment or road capacity OR lane kilometres OR road network capacity) Latent demand and road
Mar 1, 2022 · Capacity reduction has a similarly strong effect on travel demand (suppressed traffic) as capacity extension. Reducing urban road congestion by infrastructure development promises lower travel times, reduced pollution and wider economic benefits.
Jul 1, 2000 · The first study (SACTRA 1994) compiled empirical evidence on 'induced' traffic as a result of increased road capacity, and it concluded that this was indeed a real phenomenon.
The literature documenting this experience deals, in essence, with two phenomena associated with road capacity change -- ‘induced’ and ‘suppressed’ traffic. The paper begins by defining and explaining the behavioural responses that give rise to these phenomena (sections 2 and 3).
Aug 1, 2023 · Moreover, building more roads to relieve congestion is controversial because road network capacity expansions are believed to induce rise in aggregate traffic volumes (Small and Verhoef, 2007) and potentially worsen the problem (Graham et al., 2014).
Road capacity change and its impact on traffic in congested networks: evidence and implications. This article reviews explanations of, and international empirical evidence for, ‘induced’ traffic as a result of increased road capacity and ‘suppressed’ traffic as a result of decreased road….
