colours

[cockney kid]

high casualty road 3/5letters must have a colour in the answer

[bookwormer]

Red route

[ash24]

black spot

[ash24]

odd question
A Red Route signifies that you cannot stop along it at any time when it is in force. It has nothing to do with casualties.
It has everything to do with assisting traffic flow

[cockney kid]

red route thank u black spot thanks it was my answer but tomany letters 3/5

[ash24]

if Black spot is the answer, then the question was wrong
.... but good luck

[sddsddean]

It is red route. Although this is a 'bus only' type lane in cities (esp London), there are loads of roads in the country that have signs like ' Red Route 20 casulties in the last 3 years'.
This is the sort of sign used
http://www.northants.police.uk/default.asp?act ion=article&ID=2132