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57
Table 32. LRT alignment classification.
Class Category Description of Access Control
Exclusive Type a Fully grade separated or at-grade without crossings
Type b.1 Separate right-of-way
Semi-exclusive Shared right-of-way, protected by barrier curbs and
Type b.2
fences (or other substantial barriers)
Type b.3 Shared right-of-way, protected by barrier curbs
Shared right-of-way, protected by mountable curbs,
Type b.4
striping and/or lane designation
Type b.5 LRT/pedestrian mall adjacent to parallel roadway
Non-exclusive Type c.1 Mixed traffic operation
Type c.2 Transit-only mall
Type c.3 LRT/pedestrian mall
Source: TCRP Report 69
prevents more accidents. Gates in general can be problem- compiled in a catalog format and attached as Appendix A for
atic (bell noise, mechanism maintenance and durability) ease of use.
when the frequency of LRT service is very high. The treatments included in the catalog are organized into
· Grade separation: Exclusive alignments typically experi- seven categories. The categories are intended for reference
ence few (if any) collisions, and grade separation at inter- organization purposes only, and some treatments may fall
sections could be considered a safety treatment. Grade into more than one category, but every treatment has been
separation converts a type b alignment to a type a align- listed only once. It is also noted in the catalog that some treat-
ment for the length of the separation. However, exclusive ments have been referred to by several names.
alignments are not addressed in the catalog due to the The categories and treatments are:
extreme implementation costs in comparison with other
treatments and the combination of space requirements 1. Signals and active warnings
and possible environmental impacts that make them likely a) Signal priority
to be a treatment of last resort. b) Transit signal pre-emption
c) Audible crossing warning devices
The catalog could eventually be presented as a searchable d) Constant warning time systems
database that could be updated by approved users. LRT Agen- e) Pre-signals
cies, SSOs, and other users could be encouraged to access the f) Flashing light signals
database and to add treatments and information about the g) Limits on downtime of gates
treatments as information becomes available. Statistical reports h) Crossing horns--automatic and LRVoperator-
and research on treatments could be added to the database, and activated
subscribers could be notified of changes. i) Illuminated, active, in-pavement marking systems
As noted in the main body of the report, this project prima- j) Blank out signs
rily addressed semi-exclusive alignments. The catalog includes k) Pedestrian signals
a field suggesting the type of alignments to which each treat- 2. Signs
ment can be applied. For clarity, the alignment types are given a) Stop and yield signs
in Table 32. b) Retroreflective advance warning signs
c) Flashing train-approaching warning signs
d) Gate crossing status indication signals
LRT Safety Treatments
3. Second train approaching treatments
Included in the Catalog
a) Second train approaching signals and active signs
The information presented in the catalog was collected b) Second train approaching warning signs
throughout the project. Much of the information came 4. Gates
directly from LRT agencies that cooperated with the project a) Pedestrian automatic gates
team during a series of site visits. Additional information was b) Four-quadrant gates
gathered during the literature review and during phone con- 5. Pedestrians
sultations with LRT agencies and SSOs. The information was a) Pedestrian fencing/landscaping
