Tillståndsuppföljning av observationssträckor: lägesrapport för LTPP-projektet till och med 2012-–12

Download

The objective of this project is to collect and deliver high quality road data primarily for the development of performance prediction models. The monitoring of the LTPP sections started in 1984 on commission of the Swedish Road Administration. The aim is primarily to focus on road deterioration caused by heavy traffic. In 2012 there were still 304 active LTPP sections distributed over 33 sites. The monitoring programme includes the following activities: • Distress surveys. Annual surveys are carried out by walking over the sections. During the survey all distresses and surface defects are recorded. The grading of the distresses and defects is based on a national distress manual. • Road surface monitoring. The monitoring is carried out every second year using a vehicle developed by VTI. The ‘Laser Road Surface Tester’ can be equipped with up to 19 laser gauges. • Measurement of the bearing capacity. The capacity is calculated with a Falling Weight Deflectometer and normally carried out one year after maintenance measures. The normal strategy is to measure all new sections and after maintenance. • Collection of climate data from automatic weather observation stations close to the sections. • Collection of traffic data normally every fourth year. • Quality control check of all collected data. • Calculation of an annual crack index. The index is calculated from the type of crack, crack distress grade and crack propagation.

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...