Campaign group Better Shrewsbury Transport says the design of the proposed cycleway is out of date and could prove dangerous for cyclists.
But Shropshire Council says it is in line with the national, Design Manual for Roads and Bridges guidelines.
The proposals include a three metre wide combined cycleway and footway along the entire 6.9 kilometre length of the road which will run from the Churncote roundabout on the A5 to Battlefield.
A spokesman for the council said: "It would have a 1.5 metre separation away from road traffic and fully complies with national standards in the Design Manual for Roads and Bridges - CD143 Designing for walking, cycling and horse-riding.
"This 1.5metre separation is appropriate for the nature of the proposed road and the numbers of cyclists and pedestrians likely to use the route.
"Any further enhancement of the cycle provision would not generate additional benefits and would divert funds away from active travel opportunities in Shrewsbury and surrounding areas that could have a far greater impact, reduce in congestion in the town and help encourage more people to take up alternative transport methods."