(1)    Routine maintenance. Subject to sub. (1r), the state trunk highway system shall be maintained by the state at state expense. The department shall prescribe by rule specifications for such maintenance and may contract with any county highway committee or municipality to have all or certain parts of the work of maintaining the state trunk highways within or beyond the limits of the county or municipality, including interstate bridges, performed by the county or municipality, and any county or municipality may enter into such contract. Maintenance activities include the application of protective coatings, the removal and control of snow, the removal, treatment and sanding of ice, interim repair of highway surfaces and adjacent structures, and all other operations, activities and processes required on a regular, continuing basis for the preservation of the highways on the state trunk system, and including the care and protection of trees and other roadside vegetation and suitable planting to prevent soil erosion or to beautify highways pursuant to s. 66.1037, and all routine measures deemed necessary to provide adequate traffic service. Maintenance activities also include the installation, replacement, rehabilitation, or maintenance of highway signs, highway lighting, and pavement markings, and the maintenance of traffic control signals and intelligent transportation systems. The department may contract with a private entity for services or materials or both associated with the installation, replacement, rehabilitation, or maintenance of highway signs, highway lighting, and pavement markings and the maintenance of traffic control signals and intelligent transportation systems.

   (1b)   Emergency repair and protection of state trunk highways. To accomplish prompt repair, protection or preservation of any state trunk highway which has been closed or is being jeopardized by extraordinary damage by flood, structure failure, slides, or other extraordinary condition of necessity and emergency, the department may, if it is deemed for the best interest of the state, proceed at once to repair or protect the highway with forces and services of private constructors and agencies, summarily engaged by the department and cause said work to be done by negotiated contract or agreement without calling for competitive bids, provided that any such contract or agreement involving an estimated expenditure in excess of $10,000 shall be subject to approval of the governor before it becomes effective.

   (1m)   Mass transit system, maintenance. When the public mass transportation system uses a state trunk highway, such facilities shall be maintained by the state at state expense in accordance with this section. Maintenance shall be performed within the highway right-of-way, upon facilities and lands within the highway corridor, and upon such terminal and parking facilities as may be reasonably adjacent to the highway corridor.

   (1r)   Sponsorship agreements. The department may enter into sponsorship agreements under s. 84.01 (36) that require the sponsor to perform maintenance activities, in accordance with the department’s standards, for the benefit of the department.

   (2)   Repayment for state work.

      (b)    When any county or municipality maintains the state trunk highways within or beyond the limits of the county or municipality, including interstate bridges, in compliance with the arrangement with the department, the department and the county or municipality may agree to a payment method and terms other than that specified in par. (a), including payment according to a contract price for maintenance services rather than payment of the actual cost of the maintenance.

   (3)   Weed control. The highway patrolman shall destroy all noxious weeds as provided in s. 66.0407 on any highway which he or she patrols.

   (4)   Emergency repairs; blocking streets or roads; detours. Except in case of emergency, no city, village or town shall obstruct any street or road over which any state trunk highway is marked unless it first makes arrangements with the department for marking a detour.

   (5)   County highway department maintenance capacity and funding. The department shall work cooperatively with county highway departments to determine an appropriate level of state work sufficient to fully utilize manpower and equipment needed for winter maintenance.

   (7)   Deer killed by vehicles. The department shall establish a program for the removal and disposal of deer killed by vehicles on state trunk highways.