I actually think that if toll roads allowed for higher speeds than interstates, such as this one, then it would make people warm up to toll roads more. I would be willing to pay a little bit to be able to drive faster.
This is the policy of the Oklahoma Turnpike Authority. Speed limits on turnpikes are 75 while they're 70 on interstates.
Then again, building a road with a higher design speed would cost more, too.
Most of the Oklahoma turnpikes are built to early '50s standards. I have no idea what the design speed is (does anybody know?) but I would guess it's not much more than 75, especially on the Turner Turnpike.
The 75 mph speed limit on the Oklahoma Turnpikes, at the least the I-44 ones in which I have rode, are easily doable because of the long distances between exits and long straight aways.
I agree with Cody on the point that, if toll roads allowed for higher speed limits, it would add to their appeal and perhaps their draw. There should
be a perk for choosing the toll road over the free alternative such as the case for SH 130.
As for Justin's comment about hitting birds, nowhere else have I been where the birds fly so stupidly low than in Texas (especially west Texas). With 70 mph speed limits on two lane FM and RM roads, we came close to hitting them at least 100 times over in May.