Environmental Engineering Reference
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Table 5 Shopping trips in related trip chains (Gonzalez-Feliu et al. 2012b )
Shopping trips in shopping related chains
Shopping trips in household-shopping-
household rounds
Household zone
Total
No private car (%)
Private
car (%)
Total
No private car (%)
Private
car (%)
CUA
172,923
79.5
20.5
134,313
76.6
23.4
NP
206,543
36.3
63.7
158,128
45.3
54.7
FP
251,865
29.5
70.5
182,621
30.6
69.4
Total
631,332
45.4
54.6
475,061
48.4
51.6
5.1.3 Distance Calculation
After assigning each trip to its household zone, the distances can be estimated. The
procedure is similar to that of the IEM module, i.e., from a shopping trip chain
database, we could estimate the composition of shopping trip chains from the
Urban Personal Trip Survey of Lyon (Gonzalez-Feliu et al. 2012a ), we extracted
the main characteristics of shopping-related trip chains. Indeed, in Table 5 we
report the number of trip chains whose main purpose was a purchasing activity.
We observe that the use of private cars for shopping trips is strongly influenced by
the urban zone where the household is located. Moreover, 94 % of these private
car shopping trips are included in a round trip containing only shopping trips, the
initial and final location of the round trip being the household. Note that trips
belonging to these rounds represent about 80 % of the total shopping trips, 9 and
work-shopping-household trips represent about 15 % of the total number shopping
trips with an average distance of 3 km.
From the database obtained, we estimate for each Household-Shopping zone
pair the percentage of shopping trip rounds (household-shopping-household), of
shopping-based trip rounds (household-shopping-other-household) and work-
shopping-household trip chains. Then we calculate the main trip distances (i.e.
origin-first stop and last stop-household) and add the average distance of the inter-
stop trips. The method is analogous with that of IEM estimation and allows direct
comparison between the two categories of flows.
9
According to a statistical extraction on the same data sample.
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