A driving question for a change!
in [UK Drivers]
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From: DavidR on 14 Feb 2010 17:00 "Nick Finnigan" <nix(a)genie.co.uk> wrote > DavidR wrote: >> >> As I said, the problem is the picture they put in the HC. The scale of >> the drawing is completely wrong, with road width too wide for the island >> diameter. Therefore the green arrow shows a car able to straightline from >> the island to join L1 after the exit without encroaching L1 before the >> exit. >> >> With practical road/island sizes, it is not usually possible to move over >> before the exit with the neat trajectory shown. > > I don't regard straightlining (as shown) as moving over - Nor would I. But as I said, in the real world it is not generally possible to perform the trajectory shown. Here it is shown as a slight left on entry, right (to 270) and then straighten. A real roundabout usually requires a left, right, left, straighten. > the latter would mean driving along the lh lane steering slightly to the > right for some distance before steering left again to take the exit. That is the exactly the sort of problem that some circulating drivers pose to drivers trying to enter the roundabout (spiralling): they start unwinding the right hand arc too soon. Effectively they turn a two lane roundabout into a single lane. And sometimes these drivers wonder why drivers trying to enter get uptight with them. > Traffic permitting, you can always straightline the exit (i.e. leave the > rh lane steering ahead and pass through the lh lane without steering to > the right). That's true. But keep to the island until you see the vanishing point of the road beyond the exit start to extend, which is later than taking the tangent. Essentially this is the method I prefer when leaving a two lane circle into a single lane exit because I like as much space as possible between me and the entry I am passing.
From: Harry Bloomfield on 16 Feb 2010 16:36 After serious thinking DavidR wrote : > That is the exactly the sort of problem that some circulating drivers pose to > drivers trying to enter the roundabout (spiralling): they start unwinding the > right hand arc too soon. Effectively they turn a two lane roundabout into a > single > lane. And sometimes these drivers wonder why drivers trying to enter get > uptight with them. I will not enter a roundabout even when L1 is clear, unless either L2 is also clear or it is very obvious none of the vehicles in L2 will need to use L1. > >> Traffic permitting, you can always straightline the exit (i.e. leave the >> rh lane steering ahead and pass through the lh lane without steering to >> the right). > > That's true. But keep to the island until you see the vanishing > point of the road beyond the exit start to extend, which is later than taking > the > tangent. Essentially this is the method I prefer when leaving a two lane > circle into a single lane exit because I like as much space as possible > between me and the entry I am passing. Quite the opposite of me, I like to be close - in L1, with safety space to my right, to move into should I need to and good eye contact. I only do this on a busy roundabout, which is what I understood we were discussing and it really is one of those things you need to see or try to understand. I never get blocked out from my exit and never have anyone blowing their horn at me for getting in their way. If the roundabout and approaches are empty, then I straight line. -- Regards, Harry (M1BYT) (L) http://www.ukradioamateur.co.uk
From: DavidR on 16 Feb 2010 18:40
"Harry Bloomfield" <harry.m1byt(a)NOSPAM.tiscali.co.uk> wrote in message news:mn.85107da2cb479b83.106911(a)NOSPAM.tiscali.co.uk... > After serious thinking DavidR wrote : >> That is the exactly the sort of problem that some circulating drivers >> pose to drivers trying to enter the roundabout (spiralling): they start >> unwinding the right hand arc too soon. Effectively they turn a two lane >> roundabout into a single >> lane. And sometimes these drivers wonder why drivers trying to enter get >> uptight with them. > > I will not enter a roundabout even when L1 is clear, unless either L2 is > also clear or it is very obvious none of the vehicles in L2 will need to > use L1. Nor do . Because I can't know what the other driver is going to do. But when a driver stays in L2, it is possible to start rolling as they go past. When they drift over it is necessary to wait until they have gone past (and sit and quietly insult them).. >>> Traffic permitting, you can always straightline the exit (i.e. leave the >>> rh lane steering ahead and pass through the lh lane without steering to >>> the right). >> >> That's true. But keep to the island until you see the vanishing >> point of the road beyond the exit start to extend, which is later than >> taking the >> tangent. Essentially this is the method I prefer when leaving a two lane >> circle into a single lane exit because I like as much space as possible >> between me and the entry I am passing. > > Quite the opposite of me, I like to be close - in L1, with safety space to > my right, to move into should I need to and good eye contact. I only do > this on a busy roundabout, which is what I understood we were discussing > and it really is one of those things you need to see or try to understand. > I never get blocked out from my exit and never have anyone blowing their > horn at me for getting in their way. But you can't see them mouthing off. We are British y'know. > If the roundabout and approaches are empty, then I straight line. When quiet, it should be possible for everybody to keep rolling. |