1,474 research outputs found
Priority Management for Urban Arterials. Transferability of Techniques: Hypothetical Arterials.
A series of hypothetical corridors have been simulated, representing a range of junction spacings, capacity distribution, availability of parallel routes, bus flows and routing patterns. These have been used to test a range of traffic management measures designed to increase capacity, improve public transport operations and calm traffic. All measures have been assessed in terms of their impact on travel costs and conclusions have been drawn in terms of the appropriateness of different measures in differing contexts
Priority Management for Urban Arterials. Transferability of Techniques: York/Selby Road.
This paper describes the background and methodology employed in research funded by EPSRC to assess the effect of individual traffic control measures, both in isolation and in combination upon urban arterials. The aim of the project was to test the transferability of the techniques developed in a DRIVE II project, PRIMAVERA, to a range of different types of urban corridor. Measures can be classed into three broad categories: Congestion Management, Public Transport Priority and Traffic Calming. The scope of these measures is wide, some operating at a junction level whilst others affect the whole network. Measures from these areas are applied to a sophisticated microsimulation model of four urban arterial corridors: three in Leeds and one in Leicester. The effects of the application of individual and integrated measures are assessed in terms of their efficiency, environmental and safety impacts using a form of Multi-Criteria Analysis. Travel time and other monetary costs are also taken into consideration. This paper reports the results for the A64 York and A63 Selby Road which are the main arterial routes to the east of Leeds.
Priority Management for Urban Arterials. Transferability of Techniques: Humberstone/Uppingham Road.
This paper describes the background and methodology employed in research funded by EPSRC to assess the effect of individual traffic control measures, both in isolation and in combination upon urban arterials. The aim of the project was to test the transferability of the techniques developed in a DRIVE II project, PRIMAVERA, to a range of different types of urban corridor. The techniques concerned can be classed into three broad categories: Congestion Management, Public Transport Priority and Traffic Calming. The scope of these measures is wide, some operating at a junction level whilst others concentrate on the efficient use of road space. Measures from these areas are applied to a sophisticated microsimulation model of four urban arterial corridors: three in Leeds and one in Leicester. The effects of the application of individual and integrated measures are assessed in terms of their efficiency, environmental and safety impacts using a form of Multi-Criteria Analysis. Travel time and other monetary costs are also taken into consideration. This paper reports the results for the A47 Humberstone and Uppingham Roads which form the main arterial route to the east of Leicester
Priority Management for Urban Arterials. Transferability of Techniques: Otley/Kirkstall Road
This paper describes the background and methodology employed in research funded by EPSRC to assess the effect of individual traffic control measures, both in isolation and in combination upon urban arterials. The aim of the project was to test the transferability of the techniques developed in a DRIVE II project, PRIMAVERA, to a range of different types of urban corridor. Measures can be classed into three broad categories: Congestion Management, Public Transport Priority and Traffic Calming. The scope of these measures is wide, some operating at a junction level whilst others affect the whole network. Measures from these areas are applied to a sophisticated microsimulation model of four urban arterial corridors: three in Leeds and one in Leicester. The effects of the application of individual and integrated measures are assessed in terms of their efficiency, environmental and safety impacts using a form of Multi-Criteria Analysis. Travel time and other monetary costs are also taken into consideration. This paper describes the study of two neighbouring arterials to the west of Leeds, the Otley and Kirkstall Roads. These arterials have been considered together since they are geographically close to each other. The Otley Road is the main arterial to the north west of Leeds City Centre, linking the Outer Ring Road to the Centre and is approximately 5km in length. The Kirkstall Road is to the south of the Otley Road, running west to east. The section of Kirkstall Road chosen for inclusion in this combined corridor is 3.5 km in length. The land use surrounding each corridor is primarily residential although near the city centre on the Kirkstall Road there are light industrial units. A popular district shopping centre exists halfway along the Otley Road
Priority Management for Urban Arterials. Transferability of Techniques: Methodology and Summary.
This paper describes the background and methodology employed in research funded by EPSRC to assess the effect of individual traffic control measures on urban arterials, both in isolation and in combination. The aim of the project was to test the transferability of the techniques developed in a DRIVE II project, PRIMAVERA, to a range of different types of urban corridor. Measures have been classed into three broad categories: Congestion Management, Public Transport Priority and Traffic Calming. The scope of these measures is wide, some operating at a junction level whilst others have an impact over a whole corridor. Measures from these categories are applied in a sophisticated microsimulation model of a series of hypothetical networks and four urban arterial corridors: three in Leeds and one in Leicester. The effects of the application of individual and integrated measures are assessed in terms of their efficiency, environmental and safety impacts using a form of Multi-Criteria Analysis. Travel time and other monetary costs are also taken into consideration. Whilst these results are of interest to local planners in the operation of each of the arterial corridors studied, a wider insight into the operation of urban arterials can be drawn from this study leading to more efficient control of the available road space
The TRIPs Agreement: Is it Beneficial to the Developing World, or Simply a Tool Used to Protect Pharmaceutical Profits for Developed World Manufacturers?
The RHMC Algorithm for 2 Flavours of Dynamical Staggered Fermions
We describe an implementation of the Rational Hybrid Monte Carlo (RHMC)
algorithm for dynamical computations with two flavours of staggered quarks. We
discuss several variants of the method, the performance and possible sources of
error for each of them, and we compare the performance and results to the
inexact R algorithm.Comment: Lattice2003(machine) 3 pages, 1 figure. Added referenc
Comparing the R algorithm and RHMC for staggered fermions
The R algorithm is widely used for simulating two flavours of dynamical
staggered fermions. We give a simple proof that the algorithm converges to the
desired probability distribution to within O(dt^2) errors, but show that the
relevant expansion parameter is (dt/m)^2, m being the quark mass. The Rational
Hybrid Monte Carlo (RHMC) algorithm provides an exact (i.e., has no step size
errors) alternative for simulating the square root of the staggered Dirac
operator. We propose using it to test the validity of the R algorithm for
simulations carried out with dt m.Comment: 3 pages, proceedings from Lattice 2002 poster presentatio
Approximation Theory for Matrices
We review the theory of optimal polynomial and rational Chebyshev
approximations, and Zolotarev's formula for the sign function over the range
(\epsilon \leq |z| \leq1). We explain how rational approximations can be
applied to large sparse matrices efficiently by making use of partial fraction
expansions and multi-shift Krylov space solvers.Comment: 10 pages, 7 figure
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