7db wrote:Cars come in integers. Anything less that 2 cars is single track.
Gareth wrote:If cars are approximately 2m wide, and a single carriageway is, in general, at least 5.5m wide, there is only room for one car in each direction plus a margin for safe passage.
Astraist wrote:Gareth wrote:
A family car is normally less wide than two meters, and stands at an average of 1.7 meters. As for, "at least 5.5m wide" - at least is the operative word. The average single carriageway (with a center line) should be about six meters wide, sometimes even seven meters.
true blue wrote:I wonder whether the whole thing would be a lot safer if it were to revert to three lanes, but with the central lane alternating to be available to only one side at a time.
true blue wrote:I wonder whether the whole thing would be a lot safer if it were to revert to three lanes, but with the central lane alternating to be available to only one side at a time. It would stop people thoughtlessly sailing up the middle from both sides, and with sensible layout would have very little negative effect on traffic flow.
michael769 wrote:Gareth wrote:In the UK the regulations (pdf) say that single carriageways less than 5.5m wide should not have a centre line (paragraph 4.6).
TSM is guidance not law. No such regulation exists.
GJD wrote:true blue wrote:I wonder whether the whole thing would be a lot safer if it were to revert to three lanes, but with the central lane alternating to be available to only one side at a time.
Stop it. Those things are the devil's work.
Big Err wrote:2+1s as they are known within the Roads community. Being used as a low cost alternative to full dualling and full of lots of little anomalies made to make life interesting.......
Terry Williams wrote:The A507 was built as a two lane road. It has never had 3 lanes or an alternating 2/3 system. Overtaking through the middle is endemic.
true blue wrote:Terry Williams wrote:The A507 was built as a two lane road. It has never had 3 lanes or an alternating 2/3 system. Overtaking through the middle is endemic.
Really? In that case, someone from the Highways Agency or the Department for Transport needs to be shot, for intentionally creating such a half-cocked road! I'd be interested to know at what period in history such roads were considered either to be common or sensible...
PeterE wrote:There are quite a lot of them around
Return to Advanced Driving Forum
Users browsing this forum: No registered users and 14 guests