Travel preferences

Attribute

Driver’s driving skill ( $I_1$ )

Very Good ( $x_{1,1}$ ), Good ( $x_{1,2}$ )

Driver’s sense of direction ( $I_2$ )

Very Good ( $x_{2,1}$ ), Good ( $x_{2,2}$ )

Driver’s attitude ( $I_3$ )

Very Good ( $x_{3,1}$ ), Good ( $x_{3,2}$ )

Cleanliness of the vehicle ( $I_4$ )

Very Good ( $x_{4,1}$ ), Good ( $x_{4,2}$ )

Driver smoking ( $I_5$ )

Yes ( $x_{5,1}$ ), No ( $x_{5,2}$ )

Vehicle music ( $I_6$ )

Yes ( $x_{6,1}$ ), No ( $x_{6,2}$ )

Driver’s gender ( $I_7$ )

Male ( $x_{7,1}$ ), Female ( $x_{7,2}$ )