I am planning to drive my car on the Cabot Trail, but I have a fear of heights that would cause me trouble if the road is too close to a high ledge. Would this be an issue when driving on the Cabot Trail?
You need never be on the edge of a high ledge. For sure you should drive around the Cabot Trail in a clockwise direction so you are on the inside. The road is a wide two lane road with shoulders and there are guard rails where necessary. One good way to have a look is to look for videos on YouTube such as this one: https://www.youtube.com/watch?v=TC9S4Ehgq1s
Here is a map: https://goo.gl/maps/rG8r3NyweRL2