No Passing Zone Sign – Meaning, Rules and MUTCD Standards
No-passing zones are designated sections of two-way roadways where overtaking slower vehicles is prohibited due to restricted sight distance. The Federal Highway Administration standardizes these safety corridors through specific pavement markings and regulatory signs that prevent head-on collisions at curves, hills, and other hazardous locations.
Understanding these restrictions requires familiarity with the Manual on Uniform Traffic Control Devices, which establishes the physical characteristics of no-passing zone signage and the engineering criteria determining where such zones begin and end.
What Does a No Passing Zone Sign Mean?
The no-passing zone sign serves as a traffic control device indicating that drivers must remain in their lane and cannot overtake other vehicles until the restriction terminates. These zones typically occur where horizontal or vertical curves limit visibility to distances below established safety thresholds.
Key Identification Facts
- The R4-1 DO NOT PASS sign emphasizes pavement markings at the beginning of restricted zones
- Sight distance minima determine zone placement, such as 450 feet at 40 mph 85th-percentile speeds
- Double solid yellow lines prohibit passing movements in both directions simultaneously
- Zones terminate where PASS WITH CARE (R4-2) signs appear or where sight distance exceeds minimum requirements
- Measurement standards require 3.5-foot eye height above pavement for sight distance calculations
- Adjacent zones in opposite directions may connect if separated by less than 400 feet
| Attribute | Specification |
|---|---|
| Regulatory Sign Code | R4-1 (DO NOT PASS) |
| Warning Sign Code | W14-3 (NO PASSING ZONE) |
| Zone Termination Sign | R4-2 (PASS WITH CARE) |
| Primary Pavement Marking | Two solid yellow lines (two-way prohibition) |
| Alternative Marking | Solid + broken yellow lines (one-direction) |
| Sign Shape | Rectangular (regulatory), Pennant (warning) |
| Placement Trigger | Sight distance below Table 3B-1 minima |
| Required Locations | Grade crossings, right-side obstructions, lane reductions |
What Are the Rules for No
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