Specifications

The system
Signal heads: the Code of Practice says that consideration should be given to providing two signal
heads on each approach. However, whether one or two signal heads are used, for safe operation, the
approaching driver must be able to see at least one signal on the approach and one whilst waiting at
the WAIT HERE sign (see ‘Setting up the equipment’). Signal heads must be either: compliant to the
European Specification EN 12368, or of a type approved to TR 2206, or the TR 0102 amendment to
BS 505. The information may be on the signal head, otherwise check with the supplier.
Portable signal controllers are linked to the signal heads and detectors by either:
• cables: which will need protecting where they cross the carriageway, and are vulnerable to
problems from turning or accelerating/braking vehicles (see page 13), or
• radio control: care needs to be taken to ensure that other sources of radio transmission and
obstructions do not interfere with the radio link.
Energy sources include: diesel or Liquefied Petroleum Gas (LPG) generator, battery or mains electrical
supply through a suitable transformer.
The above factors, taking into account any environmental considerations, may influence your choice
of system. You, or your supervisor, should check with the manufacturer if in any doubt about the
above details.
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