Policy

A Theory Of Traffic Flow In Automated Highway Systems

Broucke, M.
Varaiya, P.
1995

This paper presents a theory for automated traffic flow, based on abstraction of vehicle activities such as entry, exit and cruising, derived from a vehicle's automatic control laws. The theory formulates TMC traffic plans as the specification of the activities and speed of vehicles, and the entry and exit flows for each highway section. The theory permits the study of transient phenomena such as congestion, and TMC feed back traffic rules designed to deal with transients.

Safety and Capacity Analysis of Automated and Manual Highway Systems

Carbaugh, Jason
Godbole, Datta N.
Sengupta, Raja
1999

This paper compares safety of automated and manual highway systems with respect to result- ing rear-end collision frequency and severity. The results show that automated driving is safer than the most alert manual drivers, at similar speeds and capacities. We also present a detailed safety-capacity tradeo study for four di erent Automated Highway System concepts that di er in their information structure and separation policy.

Determinants of Bicycle Commuting Propensity: Findings from a Questionnaire-Based Investigation in Barcelona, Spain

Cole-Hunter, T
Donaire-Gonzalez, D
Curto, A
Mendez, MA
Garcia-Aymerich, J
Jerrett, M
Rodriguez, DA
Nazelle, A De
Nieuwenhuijsen, MJ
2013
The current study (of the TAPAS project) aimed to ascertain which factors, both psychological (mental) and physical (practical), were acting as the greatest determinants for bicycle commuting propensity of the working (or studying) population of Barcelona, Spain. Methods: Adults [N=795; 51% female, 87% nationals. Mean ± standard deviation: age = 37 ± 10, body mass index = 23.5 ± 3.3] who commuted to work or school in Barcelona responded to a comprehensive questionnaire (via telephone) concerning their commute activity and attitude. Respondents were categorised as either frequent or infrequent...

La Motocicleta en América Latina: Caracterización de Su Uso e Impactos en la Movilidad en Cinco Ciudades de la Región

Rodriguez, DA
Santana, M
Pardo, EF
2015

En esta investigación se examina la forma como se usa la motocicleta, sus causas, y sus consecuencias en cinco ciudades de América Latina (Bogotá, Barranquilla, Buenos Aires, Caracas y San Pablo). El propósito es generar insumos para la formulación de políticas públicas que contemplen las múltiples dimensiones del uso de la motocicleta, al mismo tiempo que busque resolver las principales consecuencias negativas que su uso conlleva. Sirve también para llamar la atención sobre otras investigaciones que deben profundizarse sobre el tema. Del trabajo realizado se desprenden factores que...

Modeling Spatial Segregation and Travel Cost Influences on Utilitarian Walking: Towards Policy Intervention

Yang, Y
Auchincloss, AH
Rodriguez, DA
Brown, DG
Riolo, R
Roux, A
2015

We develop an agent-based model of utilitarian walking and use the model to explore spatial and socio-economic factors affecting adult utilitarian walking and how travel costs as well as various educational interventions aimed at changing attitudes can alter the prevalence of walking and income differentials in walking. The model is validated against US national data. We contrast realistic and extreme parameter values in our model and test effects of changing these parameters across various segregation and pricing scenarios while allowing for interactions between travel choice and...

A42 Transportation, Air Pollution and Physical ActivitieS (TAPAS): A Comprehensive Research Programme on Active Travel

Nazelle, A De
Rojas-Rueda, D
Jerrett, M
Rodriguez, D
Cole-Hunter, T
Donaire, D
Andersen, Z
Nieuwenhuijsen, MJ
2015
Encouraging walking and cycling as means of transportation may have diverse benefits, such as reduced pollutant emissions and increased physical activity in the population. At the same time, individuals who shift to active travel modes may also experience increased risks of traffic...

A Review of the Optimized Policies for Adaptive Control Strategy (OPAC)

Liao, Lawrence C.
1998

Optimized Policies for Adaptive Control (OPAC) is a real-time demand-responsive traffic signal timing optimization algorithm for individual intersections. It was developed at University of Lowell under the sponsorship of U.S. Department of Transportation in the early 80s. OPAC distinguishes itself from traditional cycle-split signal control strategies by dropping the concept of cycle. In OPAC, the signal control problem consists of a sequence of switching decisions made at fixed time intervals. At each decision point the question is whether to extend or terminate current phase. Dynamic...

The Active Living Research 2015 Conference: The Science of Policy Implementation

Rodriguez, D
Lounsbery, MAF
Sallis, J
2016

The 2015 Active Living Research (ALR) Conference highlighted the theme of policy implementation because many policies are recommended to enhance active living, and policy adoption is becoming more common, but policies cannot be effective until they are implemented. A better understanding of active living policy implementation will assist researchers and practitioners in improving their policy recommendations and implementation practice.

Short-Term Planning and Policy Interventions to Promote Cycling in Urban Centers: Findings from a Commute Mode Choice Analysis in Barcelona, Spain

Braun, L
Rodriguez, D
Cole-Hunter, T
Ambros, A
Donaire-Gonzalez, D
Jerrett, M
Mendez, M
Nieuwenhuijsen, MJ
Nazelle, A De
2026
Cycling for transportation has become an increasingly important component of strategies to address public health, climate change, and air quality concerns in urban centers. Within this context, planners and policy makers would benefit from an improved understanding of available interventions and their relative effectiveness for cycling promotion. We examined predictors of bicycle commuting that are relevant to planning and policy intervention, particularly those amenable to short- and medium-term action. We estimated a travel mode choice model using data from a...

Active Travel, Public Transportation Use, and Daily Transport Among Older Adults: The Association of Built Environment

Yang, Y
Xu, Y
Rodriguez, DA
Michael, Y
Zhang, H
2018
To examine active travel and public transportation use among U.S. older adults and the built environment characteristics associated with them. Total active travel, public transportation trips, travel purpose diversity, total and maximum distance traveled for older adults (>= 65 years) relative to middle age adults (45–64 years) as reported in the 2009 National...