Chapter 5B. Regulatory Signs
The purpose of a regulatory sign is to inform highway users of traffic laws or regulations, and to indicate the applicability of legal requirements that would not otherwise be apparent.
The criteria for regulatory signs are contained in Chapter 2B and in other Sections of this Manual. Criteria for regulatory signs that are specific to low-volume roads are contained in this Chapter.
Guidance: STOP (R1-1) and YIELD (R1-2) signs (see Figure 5B-1) should be considered for use on low-volume roads where engineering judgment or study, consistent with the provisions of Sections 2B.04 to 2B.10, indicates that either of the following conditions applies:
- An intersection of a less-important road with a main road where application of the normal right-of-way rule might not be readily apparent.
- An intersection that has restricted sight distance for the prevailing vehicle speeds.
Figure 5B-1 Regulatory Signs on Low-Volume Roads
If used, Speed Limit (R2 series) signs (see Figure 5B-1) shall display the speed limit established by law, ordinance, regulation, or as adopted by the authorized agency following an engineering study. The speed limits shown shall be in multiples of 10 km/h or 5 mph.
Speed limits shall be established in accordance with Section 2B.13.
Speed limit signs may be used on low-volume roads that carry traffic from, onto, or adjacent to higher-volume roads that have posted speed limits.
Section 5B.04 Traffic Movement and Prohibition Signs (R3, R4, R5, R6, R9, R10, R11, R12, R13, and R14 Series)
The regulatory signs (see Figure 5B-1) in these series inform road users of required, permitted, or prohibited traffic movements involving turn, alignment, exclusion, and pedestrians.
If used, signs for traffic prohibitions or restrictions shall be placed in advance of the prohibition or restriction so that traffic can use an alternate route or turn around.
Signs should be used on low-volume roads to indicate traffic prohibitions and restrictions such as road closures and weight restrictions.
These signs may be useful on a low-volume road near and at the intersections or the connections with a higher class of road, and where the regulatory message is essential for reasonably safe transition from the low-volume road to the higher-class facility and vice versa.
Parking signs (see Figure 5B-2) may be installed selectively on low-volume roads with due consideration of enforcement.
Figure 5B-2 Parking Signs on Low-Volume Roads
Other regulatory signs used on low-volume roads that are not discussed in Part 5 shall conform with the criteria contained in other Parts of this Manual.