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TABLE 12
MEDIA FOR PEER-TO-PEER COMMUNICATION
Communication Media Percent of Agencies
Twisted pair 43
Fiber optic 41
Telephone line 20
Wireless 7
Microwave 2
Other media 5
Does not need any peer- to-peer communications 16
Note: Total percentage exceeds 100 because some of the interviewed agencies deploy multiple types of
communication media at various intersections under their jurisdiction.
in ATCS operations. Table 12 shows the percentages of vari- those for conventional traffic-actuated control systems. Most
ous media types used by interviewed ATCS users for their of the ATCS users are satisfied with the way their system han-
peer-to-peer communications. dles minor detector malfunctions and reports the major detec-
tor malfunctions. Early problems with ATCS hardware, which
Overall, ATCS users do not find that communications for was incompatible for local controllers (primarily for early
their ATCSs are much more demanding than communications installations of international ATCSs), are mostly gone. ATCS
for conventional traffic control systems. The majority of the users still sometimes struggle with handling ATCS-specific
respondents (72%) find that their communications for ATCSs hardware primarily owing to a lack of operational knowledge,
function similar to other traffic control systems. Sixteen per- which in turn indicates a lack of proper training. Although
cent of the respondents indicated that they have more problems most of the users find their ATCS software to be user-friendly,
with communications for the ATCS than with communica- there is a notion that the friendliness of the software can be
tions for their regular systems, whereas 12% of the respon- significantly improved. Most of the ATCS users do not find
dents believe that the opposite is the case. that ATCS communications cause more problems than the
communications of conventional traffic control systems. Still,
SUMMARY communications costs are one of the major operational costs
for ATCS users and communications problems may take sig-
This chapter identified system requirements for ATCSs nificant amounts of their time and resources. The next chapter
and described how ATCS users perceive those requirements. reports on the implementation costs and benefits of ATCS
Detection requirements for ATCSs remain slightly higher than deployments.
