providing information on travelling by car are divided into two categories:
Sites offering information on routing and traffic conditions. Routing
facilities are offered as a tool under mapping engines like MapQuest.
Most often routing facilities do not take into account current traffic
conditions. Sites providing data on traffic conditions on the other
hand offer time-sensitive information on primarily incidents and traffic
offer information on: route definition and description, estimated travel
time and distance. Most often information is provided through maps accompanied
by text and detail maps where start and destination points are given.
These maps are in general not clickable. Sites providing information
on traffic density and incidents deal with traffic speed, congestion,
volume, construction, closures, accidents and weather conditions. Information
on these aspects are provided through web cams, text and maps. This
up-to-date information is gathered through a network of video cameras
and traffic counters. The information is offered through separate maps
or combined into one map. In the latter special techniques are applied
to enable the user to turn layers on and off. Information on incidents
and traffic density is mostly visualised through symbols that are either
non-clickable, interactive or dynamic.
account user needs improvements encompass functionality, user interface
and graphics. Routing facilities should provide more functionality like
their CD-ROM counterparts, e.g. measuring distances and changing the
look of maps. The interface should be transparent and not too complex.
Concerning the graphics, information should be visualised more through
maps than text. When considering 'traffic maps' special attention needs
to go to the size of a symbol, better usage of visual variables, visual
hierarchy, generalisation, legends and map structure. In the latter
case most often too many aspects are combined into one map.
Last updated March