Can anyone let me know the route to Koh Chang from Ari - Victory Monument (via toll way )

Do i have to enter Rayong to pass to Chanthaburi ?

From Tollway, head to Bangkok Chonburi Motorway. Keep driving till there's a board for Rayong/Chanthaburi, then just keep following Chanthaburi boards, no need to enter Rayong.

Then once trad boards start appearing, keep following them. Then once entering Trat, you have to follow laem ngob, and take Koh Chang ferry at Ao Thammachat. Never take any other ferry company from other piers as their service and ships are just shit plus very long delays in queues, comparing to Koh Chang ferry.

From Tollway, head to Bangkok Chonburi Motorway. Keep driving till there's a board for Rayong/Chanthaburi, then just keep following Chanthaburi boards, no need to enter Rayong.

Then once trad boards start appearing, keep following them. Then once entering Trat, you have to follow laem ngob, and take Koh Chang ferry at Ao Thammachat. Never take any other ferry company from other piers as their service and ships are just shit plus very long delays in queues, comparing to Koh Chang ferry.

Correct,but you can avoid entering in Trat too.

Just get the sign to Ferry Ao Thammachat ,on the right at the big intersection at Sen Tung, about half-way between Chanthaburi and Trat.

From Tollway, head to Bangkok Chonburi Motorway. Keep driving till there's a board for Rayong/Chanthaburi, then just keep following Chanthaburi boards, no need to enter Rayong.

Then once trad boards start appearing, keep following them. Then once entering Trat, you have to follow laem ngob, and take Koh Chang ferry at Ao Thammachat. Never take any other ferry company from other piers as their service and ships are just shit plus very long delays in queues, comparing to Koh Chang ferry.

Correct,but you can avoid entering in Trat too.

Just get the sign to Ferry Ao Thammachat ,on the right at the big intersection at Sen Tung, about half-way between Chanthaburi and Trat.

Correct, If I'm not mistaken the section is about 11 km before Trat. You can follow the signs to Trat Airport as well, this is the same road that goes to the ferry.

I have Google maps on my Blackberry and that fits me well, as does a good old map.