Turn Signs - MUTCD Turn Prohibition Signs - Page 4

Road signs for sharp turns and curves include Left Curve, Right Curve, and Right Winding Road turn signs, all using a yellow diamond warning shape to alert drivers to an upcoming bend before they reach it. These curve-warning turn signs give drivers time to slow down and adjust their line through the turn, especially on higher-speed roads where a sharp curve isn't visible far in advance.

Traffic control symbols for dedicated turn lanes and highway exit turns include Right Turn Only and Left Turn Only turn signs, which are regulatory signs requiring drivers in that lane to make the indicated turn. These turn signs are commonly posted above or beside a dedicated lane at a busy intersection or highway exit ramp, making it clear before the driver commits to that lane which movement is required.

A turn sign should be mounted where it gives drivers enough advance notice to react safely, typically before the intersection, curve, or lane where the turn restriction or instruction applies. MUTCD guidance recommends placing warning-style turn signs, such as curve or turn arrow signs, farther back on higher-speed roads to give drivers more time to slow down, while regulatory turn signs, such as No Left Turn or Right Turn Only, are generally posted at or near the intersection where the restriction takes effect.

Many turn signs, such as the No Left Turn, No Right Turn, No U-Turn, and Right Turn Only symbol signs, are MUTCD compliant, built to official federal specifications for shape, color, and legend, while the collection also includes non-MUTCD turn signs suited for private roads and parking lots where MUTCD compliance isn't required.

Turn sign sizes vary by type and intended use. Smaller curve and U-turn symbol turn signs start around 12" x 12", while larger lane control and turn instruction turn signs run up to 36" x 48", and private-property turn signs, such as parking lot turn signs, are available in even smaller sizes like 12" x 18".

Turn signs are made primarily of aluminum, available in three grades depending on the durability and visibility needed: standard aluminum for basic applications, reflective aluminum for better nighttime visibility, and heavy-duty aluminum for high-traffic or high-wind locations. A smaller selection of turn signs is also available in reflective vinyl, a flexible option often used for portable or temporary signage, and plastic, a lightweight, lower-cost option suited for private roads and parking lots.

Standardized road signs for U-turns and left turns include the No U-Turn symbol turn sign and the No Left Turn symbol turn sign, both white rectangular regulatory turn signs with a black symbol and red circle-and-slash. These turn signs follow the same MUTCD design nationwide, so a No U-Turn or No Left Turn turn sign looks identical whether it's posted in one state or another.

A no left turn sign prohibits drivers from turning left at that specific intersection, while a no U-turn sign prohibits drivers from making a full U-turn to reverse direction, and both are regulatory turn signs that can be posted independently or together depending on which movements need to be restricted at a given location.