Table 2 Description of variables in the travel time database.

1

S2cellid

The ID of the 0.6 km² cell (unit of analysis from which travel time was computed)

2

Center_lat_lng

Location attribute -the centre coordinates (latitude and longitude) of the cell

3

Facility_type

Three options that specify whether the destination facility from the cell is public, private or both sectors

4

Departure_time

Eight options showing combination of time of day, and day of week when journey is made: weekday/1–3 am, weekday/6–8 am, weekday/1–3 pm, weekday/6–8 pm, weekend/1–3 am, weekend/6–8 am, weekend/1–3 pm, and weekend/6–8 pm

5

n_within_15

Number of facilities within 15 minutes of the reference cell (cell ID and its coordinates) for each category of facility ownership

6

n_within_30

Number of facilities within 30 minutes of the reference cell (cell ID and its coordinates) for each category of facility ownership

7

n_within_60

Number of facilities within 60 minutes of the reference cell (cell ID and its coordinates) for each category of facility ownership

8

Min_travel_time_1_minutes

Travel time in minutes to the 1^st, 2^nd and the 3^rd nearest facility, respectively to the reference cell.

9

Min_travel_time_2_minutes

10

Min_travel_time_3_minutes

11

Nearest_facility_1

Unique code of the 1^st, 2^nd, and 3^rd nearest facility, respectively. The codes can be used to link with main facility database¹⁶

12

nearest_facility_2

13

nearest_facility_3

14

nearest_facility_1_coordinates

Geographic coordinates of the 1^st, 2^nd, and 3^rd nearest facility to the reference cell.

15

nearest_facility_2_coordinates

16

nearest_facility_3_coordinates