Geoscience Reference
In-Depth Information
Table 1 Time intervals for selection and evaluation of public transport possibilities
Start of the
work-shift
Earliest departure
(BF)
Latest arrival
(BF)
Earliest departure
(AF)
Latest arrival
(AF)
6:00
4:30
5:45
14:15
15:30
8:00
6:30
7:45
16:15
17:30
9:00
7:30
8:45
17:15
18:30
14:00
12:30
13:45
22:15
23:30
22:00
20:30
21:45
6:15
7:30
BF before the work-shift, AF after the work-shift
In this study the processing (6,279,563 combinations of municipalities) was
performed on 35 computers and the time of processing was about 40 h. Data was
processed by Tr
č
ka [
26
].
The conditions of public transportation for commuting were evaluated for each
year in the period of 2007
2011 using valid transport timetables for these dates:
23.9.2007, 8.9.2008, 26.9.2009, 14.6.2010, and 5.10.2011. The parameters were set
according to the Table
1
. The maximum number of connection changes was 5 and
the maximal duration was set to 60 min.
The time settings obviously do not cover all commuting possibilities (arrival and
departure schedules) but
-
those called
“
suitable
”
commuting conditions or
connections.
The parameters of the optimal variant for commuting are stored to the database.
Finally, data is aggregated and used for the accessibility evaluation. Usually levels
of municipalities, districts (LAU1), and regions (NUTS3) are used for analysis.
The transport accessibility was assessed mainly using following indicators:
The rate of accessible municipalities (RA), which is de
ned as the number of
accessible municipalities per number of all municipalities tested for existing
transport connection (in %) on certain time (h) in case of one-way travelling.
The best accessible municipality has the highest value of RA.
NMA
h
;
i
NMT
h
;
i
RA
h
;
i
¼
100
½
%
where NMA is the number of accessible municipalities, NMT is the total number
of municipalities within a given Euclidean distance (i.e. 100 km), h is hour and
i
is the index of municipality.
The rate of missing return connection (RMRC) expresses the existence of a
return suitable connection after the work shift to the residential municipality.
The best accessible municipality poses the lowest value of RMRC. Zero value
means that each municipality accessible by one-way connection (under the
given conditions) also provides a suitable return connection to residential
municipality after the end of the shift.
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