Innovative 20mph sign installation with Krinner ground screws

Ground screw for Warrington signs

Case Study: Innovative 20mph sign installation with ground screws


Installation of 20mph signs across the majority of residential roads in Warrington Borough Council, as part of a 3 year rollout programme, following a successful 18 month pilot. The project was ‘Highly Commended’ as North West Safety Project of the Year 2014 at the North West CIHT Awards.


  • To minimise disruption to in residential area and generate cost efficiencies.
  • Krinner ground screws were used by the JPCS – the installation partner – for approximately 50 per cent of the signs which has enabled a more efficient delivery due to the significant gains in installation times
  • Cost-effective solution, saving 40% on estimated costs, with over £50k saved in the first phase alone
  • Best value in terms of cost savings, quality of service, safety, end user satisfaction, and programme deliver
  • Unbeatable installation time – on average seven times quicker than conventional processes
  • As the system eliminates costly, time consuming excavation and concreting, safety/customer satisfaction are increased
  • Using ground screws has enabled the partnership to stay six months ahead of schedule, with all 20mph speed limits now expected to be implemented by the end of 2014
  • Maximum efficiency – reduced time spent on site, increasing safety and reducing labour costs
  • New speed limits in place quickly, safely, and with as little disruption to residents as possible
  • Visual impact from a lower speed restriction brought forward
  • Ground screws are much less weather dependent, avoiding significant delays with the recent weather – the wettest on record
  • No digging, excavation, wet trades, or curing time, therefore challenges due to weather conditions have been significantly minimised
  • Following feedback from residents about the positioning of some of the posts, the partnership has been able to relocate them economically, quickly, and safely – due to the flexibility of the Groundscrew foundation against concrete
  • Improved resident satisfaction
  • Removal also generated minimal landfill requirements, with very little impact to the landscape
  • Minimised risk, hazard and disruption to residents/road users.