How we use cookies
A cookie is a small file which asks permission to be placed on your computer's hard drive. Once you agree, the file is added and the cookie helps analyse web traffic or lets you know when you visit a particular site. Cookies allow web applications to respond to you as an individual. The web application can tailor its operations to your needs, likes and dislikes by gathering and remembering information about your preferences.
We use cookies mainly to remember your preferences. The cookies will remember your units of measure, last page visited on the site and any information from selections (such as minimum route length).
Cookies help us provide you with a better website, by enabling us to identify which pages you find useful and which you do not. A cookie does not give us access to your computer and only the cookies written by this web site can be read by this web site.
You can choose to accept or decline cookies. Most web browsers automatically accept cookies, but you can usually modify your browser setting to decline cookies if you prefer. Most of the features on this site should still work, but you will have to frequently set settings if you change from default options.
The following tables list the cookies we use our website and explains why.
Strictly necessary cookies
Some cookies we place on your browser ensure that the website delivers you information and services securely and optimally.
You must accept these essential cookies to be able to make use of our online systems.
Preference cookies
Preference cookies enable our website to remember what cookie preferences you have set.