$($a$)$ Based on the given trip generation table what can you tell about zones $1,2,$ and $3?$

$($b$)$ Calibrate gravity model $($one iteration$)$ using the base year interchange volumes.

$\backslash$table$[[$Zone$,$Productions,Attractiveness$],[1,0,2],[2,1500,5],[3,2000,3]]$

$W_{IJ}$

$\backslash$table$[[I,J$