So what if we had ferries in Melbourne? Is it a practical way to get around the bay for commuters to Melbourne?

Surprisingly using modern jet cat ferries travel times between any location around the bay at least equals road and rail transport.

For further afield locations e.g. East of Geelong a ferry would be significantly faster.

Given urban growth around the bay and peoples desire to be near the water front where it can be more difficult to provide road and rail infrastructure, ferries appear to be a great solution.

Port Arlington to City

Ferry @30knots = 42 minutes
Car via Geelong = 100km 1:40 hours with traffic

Mornington to City

Ferry @30knots = 56 minutes
Car via Geelong = 65km 1 hour with traffic

Train from Frankston = 1 hour