If you are taking a cab and there is a toll charge along the way, make sure that you pay at the toll (pass the money to the driver) instead of waiting till the end of the trip. Sometimes, the driver charge you a much higher rate. That's what happened when the 6 of us took 2 cabs, and the other group was asked to pay the total fare at the end, while our cabby asked us to pay at the toll booth (25baht) and our cab fares differed by 70 baht, even after including the toll charges.
The highway into Bangkok from the outskirts are subject to tolls. If you get into a taxi and the driver asks if you want to go on the highway, you will have to pay the toll. It is normally quicker to go on the highway, and toll isn't much. I normally gave the driver the money when we got to the toll booth, although if you don't, he will add it to the metered bill at the end of the trip.
The only trap that you might fall into, is being taken on the highway when you don't need - ie. being taken on a longer trip than you need to.
Unique Suggestions Try having a look on the map, before making the taxi trip, and see if the route will go via the highway.
Fun Alternatives If you can - try using the buses. They aren't always very inviting - but they are great fun. You pay a conductor once on the bus. There is a good website - www.bmta.co.th, which gives the route for each bus number. Most of the routes seemed to terminate at Victory Monument, from there you can get the Skytrain to most of the popular parts of the city.
Upon arrival,I paid 350 Baht at taxi counter to Holiday Inn,Ploenchit rd,next to Chitlom Sky train Stn.Along the way the driver ask whether to use the Highways ,to which i replied ,ok.When passing the toll he ask for the toll charges which i said flatly refused.I have earlier checked with the Taxi counter staff that this is inclusive.They never give up trying????
My return trip to airport cost me only 160 baht inclusive of toll,can't figure out why so much cheaper.
Also, i took a cab from MBK to Hualamphong station.After 5 mins of driving the driver said the fare is 200 baht.I refused n told him to go on the meter or i get off.As if nothing had happen ,he took me to the station n guess what?The meter shows 59 baht .I think Bkk Cab drivers favourite pastime is fishing for unsuspecting tourists.
Unique Suggestions Be firm and ask the cabbie to go on the meter. DO NOT LOOSE YOUR TEMPERS!!
Record the taxi number that are pasted near the widows in case u want to make a report to the relevant authority/Tourist police.