This stems from US History and the class researching the Missouri Compromise.
I was initially researching about the Constitution and the legally of secession regarding the topics that had arisen. I then decided to look into Arkansas' Constitution (https://www.nationallibertyalliance.org/files/constitutions/Arkansas%20Constitution%201874.pdf) (1874), and I found some interesting stuff nonetheless!
I think I found why Arkansas does not allow (by law), the use of tolls or turnpikes:
Article 17, Section 3
Railroads, Canals and Turnpikes
3. Equal right to transportation.
All individuals, associations and corporations shall have equal right to have persons and property transported over railroads, canal and turnpikes; and no undue or unreasonable discrimination shall be made in charges for, or in facilities for transportation of freight or passengers within the State, or coming from, or going to any other State.[...]
What do you think? What are your state's laws regarding this?