A friend and I (years of bicycle touring experience) have discussed riding the ECG from Key West FL to Calais ME. Frankly I'm apprehensive about doing this ride after looking at the ECG interactive map. The ECG is not complete, many of the roads consist of high volume, high speed, and little to no shoulders. Example: US-17 in South Carolina. Are the risks I see in riding the ECG unfounded? Would you recommend riding the ECG? All? Specific parts? Thanks in advance.