First from Vihti to Herrakunta it's low speed limit and nothing special. Then next 7km's is with very nice corners!
Then Next 7km's is quite straight where you can speed up!
From Vihtijärvi to Kytäjä it's hazardous with very tight corners ans possibly gravel on the road -be careful. From Kytäjä to Hyvinkää Gas stations it's again mostly straight but there are few tight corners...
In this route there's lots of different scenery and many kind of roads!