British speed restriction commencement board

A board marking where a restriction begins.

Also known as: Speed restriction start board, TSR commencement

Engineering & technicalRoad & transportStandard profile

Meanings

A British lineside board marking the point at which a temporary speed restriction takes effect.

Officially standardisedVerified fact
Marks the point at which a temporary speed restriction takes effect.
Contexts: Public information
Officially standardisedVerified fact
Repeats the figure already given by the warning board, so a driver who missed the warning is not left without the value.
Contexts: Public information

A board carrying the restricted speed figure, placed at the exact point the lower limit begins to apply.

IdentityHigh confidence: High confidence because the identity is defined by a current official standard, but only a single source has been found so far.
Historical originLow confidence: Low confidence because the historical origin is documented in encyclopedic references, but only a single source has been found so far, but early or supporting evidence is limited, but the regional or cultural match to this specific claim is not precise.
Current useHigh confidence: High confidence because the current use is defined by a current official standard, but only a single source has been found so far.
Visual matchModerate confidence: Moderate confidence because the visual match is documented in encyclopedic references, but only a single source has been found so far.

GERT8000 Rule Book, Signals, handsignals, indicators and signs
Rail Safety and Standards Board (RSSB), Great Britain · retrieved 2026-08-24
The British national rule book module covering signals, indicators and lineside signs. Cited for a signal's identity and its defined meaning on the Great Britain network. Records are descriptive; the Rule Book itself is the operating authority and is not reproduced here.

Last reviewed 2026-08-25

Meanings

A British lineside board marking the point at which a temporary speed restriction takes effect.

Officially standardisedVerified fact

Marks the point at which a temporary speed restriction takes effect.

Officially standardisedVerified fact

Repeats the figure already given by the warning board, so a driver who missed the warning is not left without the value.

Confidence

IdentityHigh confidence: High confidence because the identity is defined by a current official standard, but only a single source has been found so far.
Historical originLow confidence: Low confidence because the historical origin is documented in encyclopedic references, but only a single source has been found so far, but early or supporting evidence is limited, but the regional or cultural match to this specific claim is not precise.
Current useHigh confidence: High confidence because the current use is defined by a current official standard, but only a single source has been found so far.
Visual matchModerate confidence: Moderate confidence because the visual match is documented in encyclopedic references, but only a single source has been found so far.

Sources

GERT8000 Rule Book, Signals, handsignals, indicators and signs
Rail Safety and Standards Board (RSSB), Great Britain · retrieved 2026-08-24
The British national rule book module covering signals, indicators and lineside signs. Cited for a signal's identity and its defined meaning on the Great Britain network. Records are descriptive; the Rule Book itself is the operating authority and is not reproduced here.

Last reviewed 2026-08-25