Varmsandning på gång- och cykelvägar: Utvärdering i Umeå av för- och nackdelar med metoden

Download

Considering the safety of cyclists and pedestrians the winter maintenance service level needs to be improved and there is a need for skid control measures that are effective and, at the same time, reduce the amount of grit spread during the wintertime. Warm wetted sand, a method were the sanding material is mixed with hot water while spreading and were the sand adheres to a cold surface through a process of melting and freezing, could be the solution. In this study, the applicability of using warm wetted sand on walkways and bike paths has been evaluated in Umeå municipality during the winters of 2010/11 and 2011/12. Comparing measurements of friction clearly showed higher levels of friction improvements and with a longer duration when using warm wetted sand for skid control on walkways and bike paths compared to traditional dry sand. The study also showed that the number of actions can be reduced when using warm wetted sand instead of traditional dry, and it is therefore possible to reduce the amount of grit spread. The method was most effective on sections with on-street-cycling were the road condition more often is thick ice. The apprehension that the method might create an uneven surface uncomfortable for cyclists was not perceived. The maintenance operators had, on the other hand, noticed that when spreading warm wetted sand on soft packed snow an uneven surface might occur, if the warm sand melts through the top layer of the snow surface. The main problem with the method is the freezing of the sand material in the hopper and the spreader, due to the high amount of fine graded particles in the sand mixture. The results are not promising enough to motivate an investment in equipment for skid control on walkways and bike paths only, but with a multi-purpose use it gets more cost effective.

MEET US


7
Dec

Shipping and the environment – research meets reality

Centre for Transport Studies (CTS) in co-operation with Ports of Stockholm invite you to the seminar Shipping and the environment – research meets reality.

LATEST NEWS


2017-10-26

Simulation of cut-in by manually driven vehicles in platooning scenarios

A study in a VTI-driving simulator has showed that a platoon will be able to handle a cut in from a manually driven car. The results of this study have recently been presented at two conferences in Japan.


2017-10-16

ERPUG Forum

The five-year anniversary of European Road Profile Users' Group (ERPUG) Forum will take place at Ramboll head quarter, Copenhagen, Denmark October 19-20, 2017.


2017-09-29

Self-driving buses in Sweden next year?

A self-driving, fossil-free bus. This idea might become reality through a forthcoming collaborative project involving the Swedish National Road and Transport Research Institute (VTI), Linköping University and several other participants. The project group aim...


2017-09-29

New climate-proof solutions for hard surfaces in cities

High-density road infrastructure that emphasise maximum durability and minimum maintenance create inflexible systems, which put increased stress on urban trees and lead to increased risk for flooding. Over the past five years, the ‘Climate-proof solutions for...


2017-09-29

VTI is preparing for automated vehicles

Automation of traffic systems will lead to major changes. The European Union’s (EU) CoEXist research project began in June 2017 with the aim of preparing cities and road operators for the introduction of self-driving vehicles. The Swedish National Road and...


2017-07-05

Vehicle Driver Monitoring: sleepiness and cognitive load

To prevent road crashes it is important to understand driver related contributing factors, which have been suggested to be the critical reason in 94 per cent of crashes. The overall aim of the project Vehicle Driver Monitoring has been to advance the...