A longer tunnel, a land bridge, extensive use of landscape haha's, a Fairy Rainbow? There is simply is no end to the endless line of pointless pitches thrown by the infrastructure landforming Heritage Industry Companies like Infandor, Colicon, Myrimmer, Pelladinnor etc. as they try and get their respective snouts in the Public Money Slurry Pool.
If the road annoys the stones then close the road and make people go round the long way. If it simply annoys some visitors then they must be told to get over it. And get over themselves. They built a crapulous visitor centre and a bus road which cuts across the Henge not once but twice. What a sham. English Heritage suggests a visitor should
"Watch the seasons pass and take a trip through time with our incredible "audio-visual 360 degree view from inside the Stones" in the visitor centre. Imagine what it feels like to stand in the middle of Stonehenge at winter and summer solstice, with this unique and memorable experience."
If visitors are being encouraged to imagine that lot above the Pan Pipes, Dream Catchers and Ambient Whale noise then they can surely imagine that the traffic on the A303 isn't there...

http://www.english-heritage.org.uk/content/properties/stonehenge/things-to-do/stonhenge_138-_15-08-14_robert-smith---copy-crop

I'd like the M74 removed and diverted under a big tunnel as it interferes with the vibes at Wildshaw Burn.

http://www.themodernantiquarian.com/site/3588/wildshaw_burn.html

K2 Plant Hire had the right idea. Enough of Stonehenge. It simply doesn't work properly any more. It has been broken down for years. Either let it crumble gently to dust or grind up the weathered old rocks, recast them with some industrial resin and reconfigure the place for a New Age. It'll cost a lot less than a tunnel or a Fairy Rainbow.

They've now said it formally: the advantages CANNOT be offset against the damage and the scheme should be reconsidered.
https://heritageaction.wordpress.com/2017/07/07/unesco-formally-confirms-uk-government-should-reconsider-stonehenge-a303-project/

I think Swindon's finest have the best answer.

https://youtu.be/ErWSYJYKM-Q

Hey!
I heard the dandelions roar in Piccadilly Circus
I heard the dandelions roar in Piccadilly Circus
Take a packet of seeds
Take yourself out to play
I want to see River of Orchids where we had a motorway

Push your car from the road
Push your car from the road

Just like a mad dog you're chasing your tail in a circle
Just like a mad dog you're chasing your tail in a circle
It's all in your back yard
You've the whole world at your feet
I said the grass is always greener when it bursts up through concrete

Push your car from the road
Push your car from the road

River of Orchids winding our way
Want to walk into London on my hands one day
River of Orchids the road overgrows
Want to walk into London smelling like a Peckham beggar rose

Just like a mad dog you're chasing your tail in a circle
Just like a mad dog you're chasing your tail in a circle
It's all in your back yard
You've the whole world at your feet
I said the grass is always greener when it bursts up through concrete

I had a dream where the car is reduced to a fossil
I had a dream where the car is reduced to a fossil
Take a packet of seeds
Get yourself out to play
I want to see River of Orchids where we had a motorway

Push your car
It's all in your back yard
Push your car
Take a packet of seeds

River of Orchids winding my way
Want to walk into London on my hands one day
River of Orchids the road overgrows
Want to walk into London smelling like a Peckham rose
River of Orchids
I heard the Dandelions
River of Orchids
Just like a mad dog
River of Orchids
I had a dream
River of Orchids
I heard the Dandelions