Dual-treadway corridors are used when incompatible uses
coexist in the same corridor. In these cases, it is important to provide
more than one trail, each tailored to the unique needs of a use mode or group
of use modes.
Incompatible uses may be a result of drastically differing
speeds, trail surface needs, or volume of users. The following list of incompatible
modes shows those uses which warrant separate treadways if both are planned
in one corridor.
- Bicyclists/pedestrians and equestrians. These two user types have different
requirements for trail surface, and bicycles and pedestrians may frighten
- Bicyclists/pedestrians and OHV/motorbike users. These two user types
have greatly different average speeds, which could create hazards for both
groups. In addition, the two groups require different trail surfaces.
- Equestrians and OHV/motorbike users. Despite the similarity of trail
design for these two modes, the speed and noise of OHVs and motorbikes could
- Pedestrians and bicyclists/in-line skaters. If traffic volume on a trail
is very high, dangerous conflicts can occur. In cases of high traffic volume,
the multi-use trail should be split into separate trail facilities for these
two groups (see "Bicycle Trails"
and "Pedestrian Trails").
When dealing with dual treadways, there are two issues
- The design of each treadway.
- The separation of the various treadways.
The design of each treadway is similar to that described
above under "Single-Treadway Corridors." Each treadway should follow
the most stringent guidelines, based on the user modes it will host. In addition,
each treadway should be wide enough to permit users to travel in both directions.
The separation of treadways varies with local conditions
and planned user modes. The following is a brief list of some common dual-treadway
corridors and recommended separations.
FIGURE 4-22: MULTI-USE AND EQUESTRIAN TRAILS
Separation between multi-use trails and equestrian trails:
2 feet or greater, possibly with a fence or planted median between them
(clear zones from each trail to any fence or tree should be maintained)
(see Figure 4-22).
FIGURE 4-23: MULTI-USE AND OHV TRAILS
- Separation between multi-use trails and OHV/motorbike trails: distance
is variable, but a vegetative buffer or fencing should be provided (see
FIGURE 4-24: MULTI-USE AND SNOWMOBILE TRAILS
- Separation between paved trails and adjacent snowmobile trails: none
required, but edge of paved surface should be clearly marked in winter (see
FIGURE 4-25: EQUESTRIAN AND OHV TRAILS
- Equestrian and OHV/motorbike trails: as far apart as possible, with vegetative
buffer or fencing provided (see Figure 4-25).
FIGURE 4-26: MULTI-USE TRAIL WITH SEPARATED PEDESTRIAN TREADWAY
- Pedestrian trails and bicycle/in-line skating trails: at minimum, a solid
white stripe; 2-foot break in pavement preferred (see Figure 4-26).