Bill Analyses and Ratings
Bill Information: S1340 – Idaho Left-Lane Driving Restrictions & Fines
Bill Summary
Senate Bill 1340 amends Idaho Code Sections 49-630 and 49-655 to establish explicit restrictions on left-lane driving on multilane highways. Under the new provisions, drivers may only use the left-hand lane when directed by traffic control, preparing for a left turn, actively overtaking another vehicle, or when right-hand lanes are congested. Drivers in the left lane are prohibited from impeding vehicles behind them and from traveling slower than vehicles to their right. Violations carry a $75 infraction fine. The bill also directs the Idaho Transportation Department to post signs on multilane highways informing motorists of these requirements.
The bill reorganizes the existing slow-vehicle rule — previously applicable to all highways — so that it explicitly applies to multilane highways, and adds a $75 fine to the existing prohibition on impeding traffic flow in the left lane of controlled-access highways under Section 49-655. The emergency clause makes the law effective July 1, 2026.
Overall Assessment
This bill tightens lane discipline on Idaho’s multilane highways by restricting left-lane use to specific circumstances and attaching a $75 fine to violations. Every Idaho driver who uses multilane highways is directly affected, as the law creates new enforceable obligations and financial penalties where none previously existed. The legislature mandates the Idaho Transportation Department to erect informational signs statewide without specifying a funding source, creating a potential unfunded mandate on a state agency.
Rating Breakdown
ARTICLE I. RESPONSIBILITY IN GOVERNMENT (0)
The bill directs the Idaho Transportation Department to place signs on multilane highways statewide but provides no appropriation or funding mechanism to cover that cost. This creates a legislative mandate on a state agency without the corresponding fiscal responsibility that sound governance requires. The $75 fines collected may generate some offsetting revenue, but the bill makes no connection between that revenue and the signage obligation.
ARTICLE II. CITIZEN INVOLVEMENT IN GOVERNMENT (0)
This bill regulates vehicle lane usage on multilane highways and has no bearing on citizen participation in government, elections, voting procedures, or related civic processes.
ARTICLE III. EDUCATION (0)
The bill's provisions are confined to traffic lane rules and enforcement fines. It has no connection to school funding, curriculum, parental rights in education, or any other education policy matter.
ARTICLE IV. AGRICULTURE (0)
The bill addresses highway driving behavior and penalties. It contains no provisions affecting farming, ranching, agricultural trade, or water access for agricultural use.
ARTICLE V. WATER (0)
The bill amends traffic code sections governing lane usage and minimum speeds. It has no connection to water rights, water management, dams, or inter-basin transfers.
ARTICLE VI. NATURAL RESOURCES AND ENVIRONMENT (0)
The bill's scope is limited to vehicle lane regulations on multilane highways. It contains no provisions touching natural resource management, environmental policy, federal lands, or wilderness areas.
ARTICLE VII. ENERGY (0)
The bill regulates driving lane behavior and does not address energy production, energy independence, hydroelectric power, or any other energy policy matter.
ARTICLE VIII. IDAHO NATIONAL LABORATORIES (0)
The bill amends highway traffic rules and has no connection to the Idaho National Laboratory, nuclear research, or technology development priorities.
ARTICLE IX. PRIVATE PROPERTY RIGHTS (0)
The bill governs conduct on public roadways and does not affect private property rights, eminent domain, land use regulations, or property development.
ARTICLE X. STATE AND FEDERAL LANDS (0)
The bill amends Idaho's traffic code and has no bearing on state or federal land ownership, management, or transfer policies.
ARTICLE XI. WILDLIFE MANAGEMENT (0)
The bill addresses vehicle lane usage on multilane highways and contains no provisions related to wildlife management, hunting, fishing, or predator control.
ARTICLE XII. ECONOMY (0)
While the bill touches transportation infrastructure — a component of Idaho's commerce — its lane-use restrictions and $75 fines impose only minor, incidental effects on commercial drivers and do not substantively alter the regulatory burden on Idaho businesses or the broader transportation economy.
ARTICLE XIII. HEALTH AND WELFARE (0)
The bill is confined to traffic lane regulations and enforcement. It has no connection to healthcare, health insurance, patient rights, welfare programs, or public health policy.
ARTICLE XIV. AMERICAN FAMILY (0)
The bill regulates driving behavior on multilane highways and has no bearing on family policy, parental rights, marriage, or related social concerns.
ARTICLE XV. OLDER AMERICANS (0)
The bill's lane-use restrictions and fines apply uniformly to all drivers and contain no provisions specifically affecting older Idahoans' healthcare, employment, or social services.
ARTICLE XVI. LAW AND ORDER WITH JUSTICE (0)
The bill creates new traffic infractions with $75 fines, but these are civil regulatory penalties rather than criminal justice measures. The policy domain of this metric — gun rights, the death penalty, drug enforcement, incarceration, and victims' rights — is not engaged by lane-use traffic regulations.
ARTICLE XVII. NATIONAL DEFENSE – SECURING THE BORDER (0)
The bill addresses state highway traffic rules and has no connection to national defense, military readiness, border security, veterans' affairs, or the National Guard.
ARTICLE XVIII. ELECTION OF JUDGES AND IDAHO SUPREME COURT JUSTICES (0)
The bill amends traffic code provisions and has no bearing on judicial elections, constitutional interpretation, or the structure of Idaho's courts.
ARTICLE XIX. RELIGIOUS LIBERTY (0)
The bill regulates vehicle lane usage on public highways and has no connection to religious freedom, the free exercise of religion, or government interference in religious practice.