# The Traffic Signs Regulations and General Directions 2016, Paragraph 46

Extent: E+W+S

(1) Equipment used in connection with the signals (including the content of all instructions stored in, or executable by, that equipment) may only be placed if, at the time it is first placed, it complies with the requirements of BS EN 12675:2001 and BS EN 50556:2011.
(2) Sub-paragraphs (3) to (7) make provision about how the Standards are to apply.
(3) In relation to the requirements of BS EN 12675:2001, if the state specified in column 2 of an item in table 1 occurs, the class of response that applies is that set out in column 3.
(4) In relation to the requirements of BS EN 50556:2011, the class of response for an aspect of performance at an item in table 2 in column 3 (within a subject area in column 2) is that in column 4.
(5) The signal states which endanger traffic for the purposes of 5.2.3 of BS EN 50556:2011 are those specified in column 2 of table 1 at item 1, 2, 4 or 16.
(6) Upon a state described in sub-paragraph (5) occurring, all signal heads and push button units must switch off in accordance with the classes of response specified in column 4 of table 2 at items 6 and 7.
Table 1:
Requirements of BS EN 12675:2001
(1)
Item
(2)
State
(3)
Class
1
Green-green conflict
AA1
2
Green-yellow conflict
AB1
3
Yellow-yellow conflict
AC0
4
Green-red/yellow conflict
AD1
5
Green-green/yellow conflict
AE0
6
Absence of any conflicting red signal
AF0
7
Absence for conflicting red on specified signal heads
AG0
8
Absence of the last conflicting red signal
AH0
9
Absent red/absent red
AJ0
10
National signal regulations (infringement)
BA0
11
Absence of a red signal on a specified signal group
CA1
12
Absence of the last red signal
CB1
13
Absence of a number of red signals
CC1
14
Absence of specified red signals
CD0
15
Absent signal groups, yellow or green signals
CE0
16
Compliance checking
DA1
17
Stored values of timings
FA1
18
Time base frequency
FB0
19
Minimum values of time settings
FC0
20
Maximum values of time settings
FD0
21
Duration of timings
FE0
22
National signal sequences (infringement)
GA0
23
Specified signal group green to signal group green movements
GB0
24
Specified signal start-up sequence signal group movements
GC0
25
Failure of external inputs
HA1
Table 2:
Requirements of BS EN 50556:2011
(1)
Item
(2)
Subject area
(3)
Aspect of performance
(4)
Class
1
Electrical supply
Overvoltage
D0
2
Safety
Leakage current
T2
3
Enclosure
V2
4
Terminations
H0
5
Requirements of signalling intensity for safety
AF5
6
Requirements for signal states (i)
AG5
7
Requirements for signal states (ii)
X1
8
Location of monitoring elements for signals
N0
9
Test of impedance
Fault loop impedance test
AA1
10
Maintenance
Maintenance testing procedures
Y1
11
Environmental
Dry heat
AB3
12
Cold
AE2
13
Damp heat, cyclic
AK2
14
Solar radiation
AH0
15
Random vibration (operational)
AL2
16
Random vibration (transportation)
AM2

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Source: https://www.legislation.gov.uk/uksi/2016/362/schedule/14/paragraph/46 (the official version)
Page: https://openlegislation.uk/traffic-signs-regulations-and-general-directions-2016/schedule-14/paragraph-46
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.