Nice to Viareggio - SP1 ?

I want to cycle round the coast from Nice to Viareggio in September, before heading inland to Tuscany.
The SP1 road runs pretty much all the way round, but does anyone know how busy it is?
The Autostrada runs about 5km inland so is presumably taking most of the traffic, but I guess that parts of the SP1 get pretty busy as the area is quite densely populated?
Any advice or knowledge would be appreciated.
Damon
The SP1 road runs pretty much all the way round, but does anyone know how busy it is?
The Autostrada runs about 5km inland so is presumably taking most of the traffic, but I guess that parts of the SP1 get pretty busy as the area is quite densely populated?
Any advice or knowledge would be appreciated.
Damon
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