The 'Limited Vehicle Width' road sign (312) is a prohibitory sign indicating that vehicles exceeding a specified width are not allowed from this point onward. Drivers must immediately comply with this restriction, which typically begins at the sign itself. Always look for any supplementary plates that might detail specific vehicle types, distances, or times for this restriction, or indicate where it ends.
This sign signals a critical restriction on vehicle width, demanding careful attention to prevent violations and ensure road safety in Iceland. Familiarize yourself with its specific implications for your licence test and driving practice.
Limited Vehicle Width is a restrictive sign that removes a movement, access right, or operating condition that would otherwise be possible. It is used to manage safety, protect vulnerable users, reduce conflict, or keep unsuitable vehicles and behaviour out of a particular road environment. The restriction usually starts at the sign itself and continues until it is cancelled, replaced, or naturally ends according to the road-sign rules. Whenever a supplementary plate is present, it tells you exactly which vehicles, times, distances, or conditions the ban covers.
This sign prohibits or restricts limited vehicle width from the point where it applies. Drivers must obey the restriction immediately and look for any supplementary plate or end sign that explains the scope, duration, or exceptions.
Get clear, practical answers to the most common questions about the 312 - Limited Vehicle Width road sign. Learn how the sign works, what rules it represents, and how it affects real driving situations. This FAQ strengthens your understanding and supports accurate decision making for the Icelandic driving theory exam in Iceland.
The Sign 312, 'Limited Vehicle Width', means that vehicles with a width greater than a specified limit are prohibited from proceeding past the sign. The exact width limit is usually indicated on a supplementary plate below the sign. If no plate is present, the restriction still applies but the limit may be implied or based on general road rules.
When you see the Sign 312, you must check your vehicle's width. If your vehicle, including any load, exceeds the specified width limit (indicated on a supplementary plate or by context), you must not proceed past the sign. You should either find an alternative route or take a different manoeuvre if possible. If your vehicle is within the limit, you may proceed.
Yes, exceptions can be indicated by supplementary plates below the Sign 312. These plates might specify certain types of vehicles that are exempt, particular times of day when the restriction applies, or a limited distance for the prohibition. Always read these supplementary plates carefully, as they modify the sign's general meaning.
Unless indicated otherwise by a supplementary plate or an 'end of restriction' sign, the prohibition indicated by Sign 312 usually applies from the point where the sign is placed until the restriction is cancelled, replaced, or naturally ends at the next relevant junction or exit. Always be aware of your surroundings and any subsequent signs.
A common mistake is ignoring the sign because the road appears wide or empty, assuming it doesn't apply to them. Another error is not paying attention to supplementary plates that specify exceptions or the exact width limit. Drivers might also forget to check their vehicle's width, especially when carrying loads, leading to a prohibited movement.
A clear reference image of the 312 - Limited Vehicle Width road sign used in Iceland.

The 312 - Limited Vehicle Width road sign may also be known by these alternative names or terms.
The 312 - Limited Vehicle Width road sign is part of the Prohibition and Restriction Signs category, which groups together signs with similar rules and functions.
Reviewing signs like 'Limited Vehicle Width' alongside similar prohibition signs sharpens your recognition skills for the Icelandic theory test. Mastering these subtle differences through traffic sign comparison is key to accurate recall and confident driving.

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After reviewing the full list of Icelandic road signs, reinforce your learning with targeted practice. Explore our sign group categories or take a specific quiz to test your recognition and recall. Ensure you're fully prepared to identify and interpret all traffic signs for your upcoming driving theory exam.
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