Parking:
Roadside parking: $8 per hour
Most shopping mall will charge you $12-15 per hour, some may charge $20-30+ per hour
Monthly parking will normally cost $2000 - 3000, depending on where you live
Tolls:
Bridge tolls to airport: $30 (from airport to kln)
Other tolls (tunnel ... etc) : $8 - 30, more expensive from kln to hk island
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You can buy a car for a bargin in hk, however expect to pay big bucks for the ongoing cost.