COMPREHENSIVE TRANSPORTATION PLANNING
IN SHANGHAI AND EMME/2
Lu Ximing Senior Engineer
Shanghai City Comprehensive
Transportation Planning Institute
331 Tongren Road
Shanghai 200040, China P.R.
EMME/2 is a powerful tool playing a key role in transportation planning which is
significantly instructive for the sixteen billion RMB investment of transportation
construction of Shanghai in the last 10 years.
EMME/2 has been used by Shanghai City Comprehensive Transportation Planning
Institute (SCCTPI) for over ten years. Aided by over ten keys, the several dozens of
professional staff have done several hundred transportation study and achieved good
results. While developing transportation planning models, we have realized EMME/2 has
the following characteristics:
Combined Utilization of Traffic Demand Study Model and EMME/2 Modules
Traffic demand forecast model is rather complicated. It can be supported by many
software such as ALOGIT, SAS etc. to build models. In accordance with different levels
and goals, we have established two big types of macro programs -- quick-response and
detailed calculation, which have achieved satisfied expected results.
Example 1: The macro-level quick-response traffic demand model lays emphasis on
selecting two big modules -- EMME/2 matrix calculation and function calculation. Firstly
the function relationship formula among the three big systems -- land use, trip behavior
and traffic network are established; Then population and employment in the traffic zone
are input. Through several times of iteration, the effective traffic demand by strata are
worked out.
Example 2: Micro detailed traffic volume analysis model mainly selects network
calculation and volume assignment modules. Firstly, considerable network documents
and the relationship formula of assignment functions should be prepared. When analysis
needed, only the relevant required analysis data should be input. Through several times of
iteration, it is easy to output the detailed vehicle or passenger volume of intersections,
road segments or streets. The transportation condition in the about 800 small traffic zones
are calculated on the enormous network of Shanghai and achieves results on both macro
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and micro strata with high accuracy, which has close connection to the utilization of
EMME/2.
Highway Development Study and Auto Assignment Module of EMME/2
Road facilities are the essential components of transportation system, whose development
needs immense investment. In order to guarantee the timely investment of rational road
construction, road transportation assessment is an inevitable link. There is no exception
for the over ten year major road projects in Shanghai. So the adoption of auto assignment
module of EMME/2 for traffic analysis has many advantages. The characteristics of
transportation in Shanghai are the coexistence of motorized and non-motorized vehicles,
different types of traffic signals and intersection channelization. In order to make
simulation accuracy reach the requirement of engineering design, multi-level connection
is formed between network module and assignment module, which is very effective.
Fig. 1 shows the forecast condition of traffic flow on Shanghai elevated roads and ground
roads.
Rail Development Study and Transit Assignment Module of EMME/2
Rail system is the most expensive mode among public transportation system. Shanghai
entered the period of metro planning and construction from the 1980s. The overall
situation of passenger flow should be grasped based on the whole network so as to make
the alignment of metro more rational and transferring more convenient. Using EMME/2
transit assignment module to deal with the relationship of different levels on network -regular transit, medium and small size coaches, metro,etc., the positive and negative
effects of line adjustment and modification manifest sensitively. The organization of rail
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vehicle operation, fare adjustment and all kinds of transit transfer are calculated and
analyzed.
Fig 2. is the diagram of rail network forecast in Shanghai (One Option).
The practice of using EMME/2 for Shanghai transportation planning tells us that the
relationship among model, algorithm and software should be grasped. It is an important
technical work for transportation planners to use EMME/2 software correctly and
effectively.
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