Estimated Data Production for Urban Goods Transport Diagnosis - Sustainable Urban Logistics: Concepts, Methods and Information Systems - page 136

Local data : segments of activities generating urban traffic

Local data : segments of activities generating urban traffic

Traffic generation

Pick-ups /
deliveries

Urban management
traffic

Shopping
trips

Freight
through
traffic

Other
motorised
traffic

Freight
throug
traffic

Other

traffic

UGM

Traffic assignment

Network

Network

Fuel consumption

Energy balance Fuel consumption

Energy balance

Standard
data

Emissions
modelling

Standard
data

Noise emission

Noise emission

Pollutants emissions

Pollutants emissions

Noise distribution

Noise distribution

Meteorology
Topography

Air concentration

Dispersion
modelling

Air concentration

Topography

Input data Outputs

Input data Models Outputs

Fig. 8 The complete UGM environmental model (Ségalou et al. 2004 )

1. A two-step traffic model:

• generation-distribution of the traffic (five segments);
• traffic assignment on the network with six types of vehicles, according to energy
consumption: private vehicles (PV), light goods vehicles (\3.5 t), goods vehi-
cles (3.5-7.5 t), GV (7.5-16 t), GV (16-32 t) and heavy goods vehicles ([32 t).

2. A two-step environmental model:

• a model of pollutant, greenhouse gas and noise emissions;
• a model of pollutant concentrations in the atmosphere.

The environmental module was calibrated and discussed in Ségalou et al.
( 2004 ) and Albergel et al. ( 2005 ). The reader should refer to these works for a
more detailed description of the data generation and calibration procedures Fig. 8 .