I live on Squash Blossom and US1 is my back yard! It can be noisy at times; for example during bike week it is horrible; because there is a biker bar down the street. My house shakes when trains go by :(
You will hear some traffic, but US-1 is not a highly traveled roadway in Flagler county and is way less in the evening. The reason for this is that Us-1 IS WEST OF i-95.You would bevery suprized that it isn;t very bad. I just move to just west of I-95 about 1/4 mile from I-95 and don't hear to much unless a truck tire blows. It would be a good idea to go by the home a couple different times of day and listen.
From many homes n Palm Coast you can hear the traffic on I-95. Due to set backs and tree breaks the sound is greatly diminished. The sound seems to be steady and is more of a "distant rushing" sound than traffic per se. Looking at the number of homes that are near the interstate you can tell that many people find the noise as tolerable or no problem.