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Table 2
Definition of the Dummy Variables Included in the
Estimated Demand Equation
Excel | CSV
Z1-Z4 |
1994 - 1998 |
They
reflect the negative impact on traffic on the 4 A(2) motorway sections,
derived from capacity and quality improvements on the alternative free
road. |
– |
Z5-Z7 |
1992 |
They account for
the positive impact on the 3 A(4) motorway sections, derived from the Seville
World Exhibition in 1992. |
+ |
Z8-Z11 |
1995 - 1998 |
They
reflect the negative impact on traffic on 4 A(7) motorway sections as a
consequence of the extension of an alternative tollway. |
– |
Z12, Z14, and Z16 |
1993 - 1998 |
They reflect the
negative impact on traffic on 3 A(7) motorway sections, derived from the
opening of an alternative free motorway. |
– |
Z13, Z15, and Z17-Z24 |
1990 - 1998 |
They account for
the positive impact on traffic on 10 A(7) motorway sections, due to the
extension of this motorway. |
+ |
Z25 |
1996 - 1998 |
It
reflects improvements in the free alternative motorway network for the first
of the A(19) motorway sections. |
– |
Z26, Z27, and Z28 |
1994 - 1998 |
They
account for the positive impact on traffic on the 3 A(66) sections as a
consequence of the improvement and extension of the motorway. |
+ |
Notes: In Spain, the motorways (autopistas) are identified by the letter "A" followed by a number in parentheses.
These variables take the value 1 in the reported period; otherwise they are 0.
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