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


6
Oct

Open seminar with Mistra SAMS international scientific advisory...

Mistra SAMS international scientific advisory panel (ISAP) is visiting Stockholm, and the program will host an open seminar where the panel members will give talks in their area of expertise.
19-20
Oct

ERPUG 2017

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. 

LATEST NEWS


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...


2017-06-29

Tomas Svensson new director-general

Tomas Svensson was today appointed Director-General of VTI. Tomas has been acting Director-General since January 2017. 


2017-05-30

Crash testing bicycles at VTI

For the first time single bicycle crashes have been simulated at the VTI crash safety laboratory.


2017-05-15

A case study exploring firefighters’ and municipal officials’ preparedness for electrical vehicles

A VTI-study presents a social perspective on new vehicle technology. It explores the self-reported preparedness of the fire departments (i.e., rescue services) in Sweden’s three largest cities regarding rescue operations involving electrical vehicles (EVs).


2017-05-02

Pioneering research on and about bicycles at VTI

Under what circumstances might cyclists lose tyre grip? What actions could then be taken to prevent a crash? VTI is currently developing a theoretical model of the behaviour of bicycle tyres during braking and steering in different situations and on different...


2017-05-02

Virtual pedestrians create efficient stations

If more people are to choose sustainable travel, then the public transport stations of the future must be designed so that pedestrians can get where they are going quickly, without congestion or queues. The Swedish Road and Transport Research Institute (VTI)...