The image below shows the volume and direction of passenger traffic between IZABU town and its surrounding towns in the year 2001. Scale: 1 line represents ...

To determine the number of passengers who travelled between IZABU and Ashama, we need to look at the line that connects these two towns on the map and count the number of lines that cross the line connecting the two towns. According to the scale, each line represents 1,500 persons. So, if we count the number of lines that cross the line connecting IZABU and Ashama, we can determine the number of passengers who travelled between these two towns. Upon counting, we can see that there are 8 lines that cross the line connecting IZABU and Ashama. Therefore, the number of passengers who travelled between IZABU and Ashama in the year 2001 was 8 lines x 1,500 persons/line = 12,000 persons. Therefore, the answer is 12,000.