A bill introduced in the House for the General Assembly legislative session which starts in January:

HB 155  
Establishes the “Interstate 70 Public-Private Partnership Act”
Sponsor: Corlew, Kevin (014)
Proposed Effective Date: 8/28/2017
LR Number: 0648H.01I
Last Action: 12/06/2016 – Prefiled (H)
Bill String: HB 155
Next Hearing: Hearing not scheduled
Calendar: Bill currently not on a House calendar

Some of the bill text:

FIRST REGULAR SESSION
HOUSE BILL NO. 155 [pdf]
99TH GENERAL ASSEMBLY

INTRODUCED BY REPRESENTATIVE CORLEW.
0648H.01I D. ADAM CRUMBLISS, Chief Clerk

AN ACT

To repeal section 144.054, RSMo, and to enact in lieu thereof twenty-five new sections relating to the Interstate 70 Public-Private Partnership Act, with a penalty provision.
[….]
(11) “Project”, the interstate highway corridor incorporated into the state highway system, administered by the commission, and designated by the commission as Interstate 70. The project shall be located from where Interstate 70 intersects with Interstate 470 in the county with a charter form of government and with more than six hundred thousand but fewer than seven hundred thousand inhabitants to where Interstate 70 intersects with Interstate 64/U.S. Route 40 within the county with a charter form of government and with more than three hundred thousand but fewer than four hundred fifty thousand inhabitants that is to be financed, developed, or operated under agreement between the commission and a private partner…
[….]
227.760. 1. The commission and private partner may use any method to impose, collect, and enforce user fees for the use of the project, which may include, but are not limited to, toll tickets, barrier toll facilities, subscription fee accounts, billing accounts, commuter passes, electronic recording or identification devices, or other such technological advances as may be consistent with the form or function of collection of revenue for the use of the project. The display of a recording or identification device issued or authorized by the private partner to collect and enforce user fees for the use of the project on or near the windshield of a motor vehicle shall not be a violation of any law or rule in the state unless the device is attached in a manner that obstructs the operator’s clear view of the project.
2. The private partner operating the project shall post notice on and around the project in the plain view of motor vehicle operators using the project that reads as follows: “NOTICE: FAILURE TO PAY REQUIRED USER FEES IS A TRAFFIC VIOLATION. ANY FAILURE TO PAY THE REQUIRED USER FEES SHALL BE REPORTED TO THE APPROPRIATE LAW ENFORCEMENT OFFICIALS, WHO WILL ISSUE A TRAFFIC CITATION.”
[….]

[emphasis in original]

If passed the bill will start the process to turn Interstate 70 into a toll road.