Panel of advertisement of turn on the right (France)

The panel of advertisement of turn on the right , coded A1a in France, indicates the proximity of a Virage dangerous located on the right at approximately 150 meters in open country and 50 meters in agglomeration.

Use

The decision to announce a turn and the choice between the various types of signals are a function of the places and must be coherent with a homogeneous treatment on the totality of the route concerned.

The indication can in particular be established when:

the turn is not visible or readable;
the curve presents a weak ray compared to the other turns of the route or an important variation of ray, or a defect of cant;
the curve is located on a route where the sinuosities are rare.

On the bidirectional Road S located except Agglomeration, the importance of established indication is function of the risk incurred in the turn, and there exist four sequences of indication, according to the increasing importance of this risk:

not of indication or possibly indication advanced by panel of a1 type;
indication by J1 beacons and possibly by panel of a1 type;
indication by panel of the type A1 (A1a or A1b) and J1 beacons and marks out (S) J4 will multichevrons;
indication by panel of the type A1 (A1a or A1b) and beacons J4 monochevron.

In agglomeration, or on Highway, or road with roadways separated without bordering access, a1 panel can be established only or accompanied by beacons J1 and J4 to announce a turn to weak ray.

History

Although the panels announcing of the turns appeared in France before the second world war, the direction of the turn is then not differentiated. It is a2 panel of the general instruction of 1946.

On the international plan the panel of advertisement of dangerous turn on the right is normalized in the protocol of Geneva signed in 1949. it has already its final shape which will be regained in 1948. It is codified 1.3.

French side, the panel of advertisement of dangerous turn on the right is officialized only with the circular of January 19th, 1952

It is then codified A2a (instead of A1a) presents the same pictogram as currently, but on a cream-coloured bottom and with a very narrow red listel. It will be codified A1a in the general instruction on the road signs of 1955.

The final shape of a1a panel is stopped on the international plan by the convention on the road signs concluded in Vienna on November 8th, 1968, that France ratified on December 9th, 1971.

The coding of the convention of Vienna is the following one: A^a for the triangular panel of danger at white zone and A1^b for the signal.

France transposes the provisions of convention from Vienna in its regulation with the decree of June 6th, 1977 which adopts the white zone, the broad red listel but preserves its A1a coding.

Gallery of the evolution of the standards

Dimensions

As for all the control panels of danger, there exist five ranges of dimensions of A1a panels.

In the most general case, it is the normal range which is used.

The panels of the great range are normally employed on the roads with more than two ways and on certain two-track trunk roads indicated for this purpose by decision of the Minister for the Equipment.

The panels of the small range are used when there are difficulties for the establishment of panels of the normal range (line of trees close to the roadway, mountain road, verges reduced, in narrow tunnels, pavements, etc).

In the case of the panel A1a, the miniature range is in general not used.

The indication of the particularly serious dangers can be established only by the use of panels of dimension immediately above than that normally used on this section of road

Establishment

In general the panels of dangers are established with a distance from the danger of appreciably 150 meters in open country and 50 meters in agglomeration.

The bottom of the panel must be with one meter of the ground in open country and up to 2,30 m in agglomeration.

The edge of the panel nearest to the roadway must be at least to 0,7 m of this one.

The plan of front face of a panel established on verge or pavement must be slightly tilted 3 with 5° towards the outside of the road in order to avoid the phenomenon of specular reflection which can, of night, to make the panel illegible during a few seconds.

Back of the panel.

The back of the panel should not draw attention. The colors of back, the edge fallen and from against listel from manufacture must be neutral and not take again those used in road signs.

Back can comprise only one marking of lawful certification (see hereafter), other than any other inscription or any publicity.

On the back of the panel the attachment units are reproduced on the support. They are in general stuck rails: two rails for panels 500,700,1000 and 1250 mm (with two mounting flanges), three rails for the panel 1500 mm (with three mounting flanges).

Visibility of night

The panels and signs of indication must be visible and keep the same aspect of night like day. The signals of danger all rétroréfléchissants or under certain conditions defined below, are possibly lit.

The coatings rétroréfléchissants must have been the object, either of a homologation, or of an authorization of employment on an experimental basis. The retroreflectorisation relates to all the surface of the panels and signs except for the black or gray parts.

Class 2

Class 2 is obligatory for all the panels and signs:

established with more than two meters height;
established on highways and whatever their height, primary distributers;
In agglomeration, established in the sections where speed is recorded to 70 km/h.

This technology has a coefficient of Rétroréflexion three times superior with class 1, which allows a detection much more effective and increases the distance from legibility from 15 to 20% in a new state. The comparison at the end of five or ten years shows an advantage even more important for class 2.

Class 1

Class 1 is obligatory for all the panels located zones where class 2 is not it.

Homologation and certification

Since 1978, the ministerial homologation of the equipment of the road is obligatory on the whole of the French road ways. Certification NF replaces the homologation gradually. Thus, since 1995, certification is worth homologation for the equipment of road signs.

For the whole of the control panels permanent and thus in particular for the control panels of danger, certification NF - Equipment of the Road is obligatory. Marking THIS (European standard) was planned for the year 2007.

In the back of the panel, must appear the marks of certification obligatorily, namely:

the number of admission of the product: category of product (SP in this case, for indication of police force), and sequence number;
identification of the site of manufacture of the product (in light);
identification of the holder (optional);
the year of manufacture (the last two digits).

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