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January 21, 2018, 14:20:43 PM
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 1 
 on: January 19, 2018, 20:45:52 PM 
Started by Tweefo - Last post by Rigil Kent
True ... the buckets must move up and down together.

 2 
 on: January 19, 2018, 12:09:06 PM 
Started by Tweefo - Last post by Mefiante
But .... then surely no current would flow once the live wire is opened.(The potential difference between the live and neutral - each sitting at 220V relative to the ground if I read the statement correctly - would be zero or close to it.)
Bear in mind that we’re dealing with AC so the above would only be true if live and neutral are perfectly in phase (assuming that both are at a potential of 220V RMS above ground).  For comparison, with three-phase power where the phases are shifted by 120° from one another (3×120° = 360°), the RMS potential between any phase and ground is 220V, whereas it’s 380V between any two of the phases.  (It’s no coincidence that 380 ≈ 220×√3.)

'Luthon64

 3 
 on: January 19, 2018, 11:33:33 AM 
Started by Tweefo - Last post by BoogieMonster
Two words: Law Enforcement.

Once again I have to go back to what I saw in the USA: suburban roads that dwarf most SA highways (5-6 lanes) flowing in an orderly fashion. People waiting their turn... mostly... and stragglers being let in to let other traffic flow. Basically it seems the assumption is you're not a bad actor, so things just gel better. But they do have several things SA could do well to emulate:

"Fast lane(s)" on the highway that has a permanent barrier blocking it off from the other lanes (with defined entry and exit points) and you have to pay (via an e-toll tag) to be on it and you have to maintain a minimum speed (or get fined A LOT).

The other was dedicated left-turning (across the traffic) lanes - like this. .... Meaning, oncoming traffic permitting, you can move into the turning lane at speed and all other traffic can flow past without being blocked off because there's a line for the turning lane.

The last is the highest order of genius I've ever seen: Right-on-red. You can treat red lights as a yield if you're turning right. You have no idea how this made traffic flow.

Edit: And "Bypasses", if you're going in the "busy" direction and not getting off at the next interchange, you can skip a whole set of them entirely.

 4 
 on: January 19, 2018, 11:02:01 AM 
Started by Tweefo - Last post by Rigil Kent
What many fail to remember is that the return conductor, the neutral, always has a voltage of 220V.
But .... then surely no current would flow once the live wire is opened.(The potential difference between the live and neutral - each sitting at 220V relative to the ground if I read the statement correctly - would be zero or close to it.) This too little too late, of course, since the empiricists have already done their thing.

 5 
 on: January 19, 2018, 10:54:17 AM 
Started by Tweefo - Last post by brianvds
Many millions (billions?) was spent during the Joburg highway improvement project a few years ago. It mainly added lanes (and gantries). Did it improve the traffic? For a short while, yes, but now it's back to the same old story. I believe this happened all over the world, so by the time they decided on this project the data was there - adding lanes does not alleviate the problem. 

I would think that as you add lanes, it actually makes the problem worse and worse, because ever more people pile into the left lane to get off, leading to ever larger pileups.

I have been in that sort of commute in the past, and I have decided: never again. If that is what it takes for me to live in civilization, then civilization is simply not worth it.

 6 
 on: January 19, 2018, 10:35:45 AM 
Started by Tweefo - Last post by Rigil Kent
PE had its problems too. The angst from the big pile-up of '96 is still fresh in people's minds. Two lanes blocked by that jack-knived donkey cart, and Sewende Laan about to start.

 7 
 on: January 19, 2018, 09:58:12 AM 
Started by Tweefo - Last post by Tweefo
Many millions (billions?) was spent during the Joburg highway improvement project a few years ago. It mainly added lanes (and gantries). Did it improve the traffic? For a short while, yes, but now it's back to the same old story. I believe this happened all over the world, so by the time they decided on this project the data was there - adding lanes does not alleviate the problem. You just get more cars. One morning I was stuck in the left lane on the N1 trying to get off at William Nicol. I joined the left lane about 2km before the ramp. Cars, mainly taxis, would pass on the right and then push in just before the exit, resulting in us, law-abiding travelers, having to wait, and it also brought that lane to a stop. It took me something like 50 minutes to get off. Some of that time was spent sitting underneath the M71 bridge where it crosses over the N1. There is space for an off-ramp. This is quite a major road, so some of my fellow, waiting in line, travelers would have ended up on it. Also, you get the William Nicol ramp but then it is 16 km before Malibongwe. 16 km on some of the highest traffic density areas in the country. The whole idea of highways is to get the traffic to flow. To get the cars off it as soon as possible make sense to me. Don't make it easier to join the highway, because then you'll only get more vehicles on it, and then it's back to the same problem.

 8 
 on: January 18, 2018, 14:18:27 PM 
Started by Tweefo - Last post by BoogieMonster
Guess it comes back to Mefi's point... I seen on/off ramps like that in the USA, but then their drivers seem far more proficient in general.

 9 
 on: January 18, 2018, 13:38:35 PM 
Started by Tweefo - Last post by st0nes
I've seen novel highway exit designs before. Stuff like this. But it all comes down to cost and real-estate.

Traffic joining the freeway from the on-ramp into the fast lane is not a good idea.  There's one like that on the M3 in Cape Town, and it's bloody dangerous; there are loads of accidents there when some old tjorrie saunters onto the freeway in front of a hurtling Aston Martin...

 10 
 on: January 18, 2018, 12:58:38 PM 
Started by Tweefo - Last post by BoogieMonster
The point is to have an on/off-ramp that doesn't take much space, so you could build it in otherwise impractical places.

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