Transport Topics – Single/Double Summertime

  • Published: Department for Transport, 2012
  • Authors: Department for Transport
  • Date Added: 18 Mar 2013
  • Last Update: 18 Mar 2013
  • Format: html


To provide information on transport topics.



Key Findings:

  • Daylight saving Single/Double Summer Time (SDST) means putting the clocks forward by one hour throughout the entire year, so we would be one hour ahead of Greenwich Mean Time in the winter and two hours ahead in the summer.

  • An hour of daylight is moved from the morning to the evening.

  • Benefits of SDST include:

    • More daylight is available in the evening when the RTI rate is at its highest;

    • There are wider benefits, for the environment, tourism, health and leisure, as more of us are awake to enjoy daylight.

  • However, there are also concerns about making this change, including in the north of Scotland.

  • Research published in April 2009, suggested that an estimated net 80 deaths and 200 serious casualties per year would be avoided if SDST was adopted (based on 2003-7 casualty levels) – around 10 per cent of these casualty savings would be in Scotland.

  • These figures takes into account the possible increase in casualties in darker winter mornings as well as the greater reductions expected in the lighter evenings, when more casualties occur.

  • More recent estimates suggest the savings may currently be slightly lower – around 70 deaths and 190 serious casualties, due to the recent reductions in overall casualties.


Single/Double Summer Time, Benefits, Casualties, Concerns.


This information discusses the main advantages and disadvantages of Single/Double Summertime but does not describe these in detail. The research described within the webpage is not referenced.