Route Signing Guidelines
The
contains some guidelines for signing hazardous cargo routes. This section elaborates on the use of these signs. In an effort to limit the number of signs and provide statewide consistency while satisfying the federal reporting requirements, the guidelines listed in this section should be followed.
Through Routing (Large Guide Signs).
The Hazardous Material (R14-2) sign is used to identify through hazardous material (HM) routes. In most cases, the R14-2 sign is installed on pull-through guide signs located on the designated HM route. The R14-2 sign should be located above the parent sign as shown on the
. Where two through HM routes intersect, the R14-2 sign should be carried on advance guide and exit direction signs in addition to pull-through guide signs. The HM MUST FOLLOW (R14-6T) sign, as shown on the Traffic Engineering Standard Sheets, may be used on a numbered inbound route in advance of the designated through HM routes as appropriate. This sign may either be ground-mounted or mounted overhead (see Figure 5-6).
Figure 5-6. Typical signing for a designated through NRHM route on an expressway or freeway
Through Routing (Small Roadside Signs).
The R14-2 sign may be mounted below the existing ground mounted confirmation route marker assembly. The R14-2 sign is treated as another route marker, but must always be mounted on the bottom of the assembly, directly below the route shield. The R14-2 sign may be mounted below existing junction markers where two through HM routes intersect (which may include FM or SH routes) (see Figure 5-7).
Figure 5-7. Typical signing for a designated through NRHM route on small roadside route marker assemblies
If the R14-2 sign is added to an existing sign support, then the R14-2 sign must be installed at the minimum 7-foot height. Sign post lengths may need to be modified when adding the R14-2 sign to existing supports. In some cases, the sign post may need to be replaced to accommodate the additional R14-2 sign.
Prohibited Routes.
The Hazardous Material Prohibition (R14-3) sign is used on routes where hazardous material is prohibited at all times. The R14-3 sign must be used as described in Section 2B. 62 of the
. This includes mounting the R14-3 sign above pull-through, advance guide, and exit direction signs. Note that the use of this sign will be very limited because it applies to routes that are prohibited at all times. Signing that contains stipulations for certain types of NRHM or special time-of-day allowances is discouraged.Signing Upgrades.
Any signing upgrades should reflect the guidelines outlined here.TRF Review of Schematics.
Signing schematics for NRHM routes may be submitted to TRF for review.