SR 16 Traffic Overhaul Coming to St. Johns County: U-Turn Signals Replace Left Turns

Drivers on State Road 16 in St. Johns County will need to learn a new way to navigate two key intersections starting in mid-to-late September. St. Johns County Public Works is completing an intersection improvement project that will replace unsignalized left turns at Stratton Boulevard and Industry Center Road with a signalized U-turn design recommended by the Florida Department of Transportation.

The project introduces what's known as a Restricted Crossing U-Turn intersection, or RCUT, a configuration that eliminates direct left turns from side streets in favor of right turns followed by U-turns at signalized median openings. The county released an instructional video featuring Public Works Project Manager Chris Gatchell walking drivers through how the new pattern will work once construction wraps up.

What's happening

The improvements follow an FDOT Intersection Control Evaluation study that identified the RCUT design as the most efficient solution for improving traffic flow and reducing conflict points at the SR 16 intersections with Stratton Boulevard and Industry Center Road. The project is funded in part through an FDOT grant, with St. Johns County Public Works managing construction.

When complete, the project will deliver several physical changes at both intersections. New traffic signals will control the U-turn movements that replace the previous unsignalized left turns from Stratton and Industry Center. Additional turn lanes are being added to accommodate the new traffic pattern and improve overall flow. Updated pavement markings and signage will guide drivers through the reconfigured intersections.

The project also includes two new pedestrian crosswalks, one of which is located at the eastern signalized U-turn. The new traffic pattern is scheduled to go into operation in mid-to-late September 2026, pending final construction completion.

How the new intersection design works

The Restricted Crossing U-Turn design is a departure from the conventional intersection layout familiar to most drivers. Under the RCUT configuration, motorists approaching SR 16 from Stratton Boulevard or Industry Center Road will no longer be able to turn left directly onto the highway. Instead, drivers will turn right onto SR 16 and then make a U-turn at a signalized median opening a short distance down the road, looping back to continue in their intended direction.

This design is intended to reduce the number of conflict points where vehicles cross paths — a primary cause of intersection crashes. By controlling U-turns with traffic signals rather than relying on drivers to find gaps in opposing traffic for unprotected left turns, the RCUT aims to improve both safety and efficiency. FDOT has promoted RCUTs and similar unconventional intersection designs on high-speed corridors across Florida where traditional signalized intersections would create long delays or safety concerns.

The county's decision to produce a video walkthrough signals an awareness that the design will be unfamiliar to many local drivers. Projects of this type typically require a public education effort in the weeks leading up to the traffic switch, as confusion during the initial days can lead to wrong-way movements or unsafe maneuvers. Drivers are encouraged to watch the instructional video before the new pattern opens to understand the turning sequences in advance.

Why this intersection needed changes

SR 16 is a principal east-west state highway running through the northern tier of St. Johns County, connecting Green Cove Springs in Clay County to the Intracoastal Waterway and the Vilano Beach area. The corridor has experienced steady traffic growth as development spreads west from the coast along SR 16 and the parallel CR 210 corridor. Stratton Boulevard and Industry Center Road serve residential subdivisions, commercial properties, and industrial sites in the area, generating turning movements that have increasingly conflicted with through traffic on SR 16.

Unsignalized left turns from side streets onto busy highways like SR 16 become progressively more difficult and dangerous as traffic volumes rise. Drivers waiting for gaps in high-speed traffic face long delays and may take risks to complete turns, increasing the likelihood of angle and turning crashes. The FDOT Intersection Control Evaluation study that preceded this project would have analyzed crash history, traffic volumes, and projected growth to determine that the existing intersection configuration was no longer adequate.

FDOT's recommendation of the RCUT design rather than a conventional traffic signal suggests that full signals at both intersections would have created unacceptable delays on SR 16 or that the spacing between the intersections made signal coordination difficult. The RCUT allows SR 16 through traffic to maintain higher speeds with fewer stops, while side-street traffic uses the controlled U-turn movements to access the highway safely.

What this means for commuters and local traffic

The learning curve associated with the new traffic pattern will be the immediate impact for drivers who regularly use these intersections. Commuters accustomed to the old left-turn movements will need to adjust their routes and allow slightly more time for the right-turn-then-U-turn sequence. The county's video is intended to shorten that adjustment period, but some confusion and slower traffic is typical in the first weeks after a major traffic pattern change.

In the longer term, the RCUT design should reduce delays for the majority of SR 16 through traffic, which no longer has to slow for left-turning vehicles. Drivers on Stratton and Industry Center may experience shorter overall delays than they did waiting for gaps in unsignalized left-turn movements, particularly during peak hours when those gaps become scarce. The signalized U-turns provide predictable, controlled movements rather than the uncertainty of unprotected turns.

The addition of pedestrian crosswalks, including one at the eastern signalized U-turn, acknowledges that the area is not exclusively auto-oriented. While St. Johns County's growth corridors are largely car-dependent, residential development near these intersections means some residents may walk or bike to nearby services. The crosswalks provide safer crossing opportunities than were available at the unsignalized intersections, though pedestrian volumes in this area are typically low compared to urban environments.

Impact on nearby development and growth

The SR 16 corridor in this area is part of St. Johns County's western growth frontier, where residential subdivisions, logistics facilities, and commercial properties are converting former agricultural and undeveloped land. Industry Center Road's name signals its role serving industrial and warehouse uses, which are expanding in northern St. Johns County as the logistics sector seeks affordable land with highway access between Jacksonville and the I-95 corridor.

Infrastructure improvements like this intersection project both respond to and enable continued growth. The RCUT design handles higher traffic volumes more efficiently than the previous unsignalized configuration, meaning the intersections can accommodate additional development without immediate further upgrades. Property owners and developers in the area benefit from improved access and reduced crash risk, which can influence site selection and property values.

The project is also a window into how FDOT and local governments are managing growth-driven traffic on state highways in fast-growing counties. Rather than widening SR 16 to a full divided highway with conventional interchanges — a far more expensive solution — targeted intersection improvements using cost-effective designs like RCUTs allow the existing roadway to handle more traffic. This approach is common in Florida's growth corridors, where transportation funding must be stretched across many competing needs.

What happens next

Construction is in its final phase, with the new traffic pattern scheduled to activate in mid-to-late September 2026. The county has not specified an exact date, which is typical for traffic switches that depend on final paving, signal installation, and sign placement. Drivers should watch for announcements from St. Johns County Public Works as the opening approaches.

Before the new pattern goes live, the county will likely post additional signage alerting drivers to the upcoming changes and directing them to the instructional video. Temporary signs explaining the new turning movements are standard during the first weeks of operation at reconfigured intersections. Law enforcement may also increase presence to manage any confusion and ensure compliance with the new traffic controls.

Once the pattern is operational, the county and FDOT will monitor traffic flow and safety performance. Adjustments to signal timing, signage, or pavement markings are common in the months following a major intersection reconfiguration as engineers fine-tune the design based on observed driver behavior. Public feedback during this period helps identify issues that may not have been apparent in planning.

The SR 16 improvements are part of a broader pattern of intersection and corridor upgrades across St. Johns County's growth areas, from CR 210's ongoing widening and intersection projects to signal installations on SR 16 and US 1. As the county's population growth continues — St. Johns is consistently among Florida's fastest-growing counties — managing traffic on the limited number of east-west and north-south corridors remains a top infrastructure challenge. Projects like the Stratton Boulevard and Industry Center Road intersection improvements are incremental responses to a relentless pattern: more rooftops, more cars, and state highways that must move both through traffic and local access safely.