Abstract
caused problems such as traffic congestion and air pollution
leading to lower quality of life in metropolises. In such
circumstances, using traditional systems such as cycling can be of
high value. Previous international studies about cycling have
shown that maximum acceptable time for cycling has received
little attention. Considering this research gap, this paper aims to
investigate impacts of different factors such as individual
characteristic, land-use and built environment, on maximum
acceptable time for cycling. Based on a field survey of 473 Tehran
citizens conducted in one of the twenty-two Tehran municipality
districts, mixed logit models were calibrated, validated and
interpreted. Results indicate that people traveling through mixed
land-use tend to use bicycle for thirty minute-trips more than the
other land-use types. Also access to bicycle lane causes more
tendency for thirty minute-trips by bicycle. Results also indicate
that access to secure parking in destination and increasing number
of intersection on the origin-destination routes increase travelers
tendency for cycling about fifty-minute.
Keywords:
cycling, maximum acceptable time, environmental
impacts, mixed logit
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Faculty of Civil & Environmental Engineering. Tarbiat
Modares University, Tehran, Iran, 2013.
Abstract
The growth in magnitude and various impacts of traffic noise has
created an increasing attention on the prediction and control of
noise levels. This study aims at developing a noise level
prediction model under the local conditions of Amman, the
capital of Jordan. Thirty four sites, representing different
characteristics, were selected for use in model development. The
resulting prediction model incorporated variables describing
traffic and site conditions including traffic volume, composition
and speed, gradient, and distance from the source as affecting
factors, the trial model expresses noise level by the index L10
(1hr). The developed model was validated by comparing its
predicted noise levels with those measured. Further evaluation
of the model was carried out by comparing its predictions with
those obtained using the British Calculation of Road Traffic
Noise (CRTN) model. The developed model was found to
produce more accurate results, under Jordanian traffic
conditions, than the CRTN model with an average error of only
3.2%.
Keywords:
traffic noise, prediction, CRTN, modeling, Jordan
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Abstract
The evaluation of the traffic flow parameters and relating the parameters to the level of services in Daura to Kongolom Niger Republic Border road is presented in this paper. The study was carried out by using moving car observer method. Data was collected for seven consecutive days; a distance of 14 km was considered for 12 runs which make a total coverage of 336 km/day. The result shows that the traffic volume was 220 veh/h (two ways) in which the proportions of trucks, buses, cars and cycles were respectively 30 %, 30 %, 23 % and 19 %. The percent time spent following was 29.42 % and the average travel speed was 72 km/h. This corresponding to level of service “C’ this showed that the flows falls under a zone of stable flow.
Keywords:
Traffic volume, Average travel speed, Percent time spent following and Level of services
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Abstract
Distributing demand in a transportation network is based on route
choice behavior models. Generally, it is assumed that drivers use
routes with minimum time. In real world, drivers may consider
many factors other than travel times in congested networks
especially in metropolitan or two way congested transportation
networks. Travel safety is a factor that one may consider in his/her
trip route choice. The main objective of this paper was to
investigate influence of safety factors such as crash delays on
drivers’ route choice behaviors. Parameters that can cause to crash
occurrences were specified and their impacts were modeled at
macroscopic level using a simple statistical model. Then, an
equilibrium based mathematical programming model for two way
networks with symmetric link interactions was proposed. The
model was tested for a simple network and results showed that how
crash delays can impact on route choice behaviors.
Keywords:
route choice, crash delay, two way networks
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Abstract
This study aimed to evaluate the performance of asphalt mixes
utilized Reclaimed Asphalt Pavement (RAP). In addition, the
study will assess the environmental and cost impact of utilizing
RAP in asphalt mix.
The study included collection and evaluation of milled materials
from three roads from the northern, central and southern parts of
Jordan, then evaluation of inclusion of different percentages of the
RAP (0%, 5%, 10% and 15%) on the mechanical properties of
HMA mixes. Evaluation tests included dynamic creep at
25Cand 40C.
For RAPs collected from the central and southern parts of Jordan,
dynamic creep strain was found to be decreased as the percentage
of RAP in the mix was increased. However, for the RAP, 10% of
RAP was found to be the optimal replacement percentage. This is
due to marginal properties of this RAP.
The environmental impacts of producing asphalt mixtures with
different percentages of RAP were assessed The results indicated
that the utilizing RAP in asphalt pavements is very advantageous
from different perspectives. Some of the advantages of utilizing
RAP include saving of energy, reducing emissions, conservation
of asphalt and aggregate resources, reduction in asphalt concrete
mixes life-cycle cost, reduce landscape Disfigurement, disruption
to Natural Vegetation, soil erosion and sedimentation.
A case study was performed to analyze the impacts of producing
asphalt mixes with 20% amount of RAP on construction cost
asphalt mixtures. The results of the analysis indicated that using
20 % RAP will save 7.85 $/ton (17.7%), which is equivalent to
0.0.88 $/sq.m of HMA layer with 5 cm layer thickness.
Keywords:
Asphalt Mixture, Performance, Cost Impact, Environmental
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Varying Degrees of Recycled Asphalt Materials,"
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W. H., and Abadie, C., (2003) “Investigation of the Use of
Recycled Polymer Modified Asphalt Binder in Asphalt
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"