Monorail can save a lot of money, rise above the traffic and not impact the environmental.    Standard speed is 50 mph.   Newer Maglev technology Monorail can run up to 310 mph as seen in China since 2004.   

Note -

Higher Speed Monorail 

(possibly Maglev)   employed where 

the thicker lines are displayed. 

Maglev Monorail Speeds up to

170 mph. 

( see Detail Tab)