AS2890.1: off-street carpark code - Queue Areas

[pwht1]

Hi,

Would someone please explain how to use table 3.3 (minimum queue lengths at a car park with control points at entrances) in section 3.4?

I'm working on a carpark with 1800 carspaces and with less than 75% in-flow during a peak period (about 500 cars). The code says the first 100 cars: 3% of capacity, the second 100: 2% of capacity and additional cars: 1% of capacity. What does this mean? Should I expext a queue length which is at least 3% of 1800 = 54 cars? a 320m queue is ridiculous....

Thanks for any advice

 

[rowingengineer]

A traffic engineer would be able to help you in this instance, the code is very conservative in this regard.

http://www.nceng.com.au/

"A safe structure will be the one whose weakest link is never overloaded by the greatest force to which the structure is subjected” Petroski 1992

 

[rowingengineer]

and the awnser to the riddle is 3% of 100 = 3 car lengths
2% of 100 = 2 car lengths
remaining 1600 is 1% = 16 car lengths

making for a total of 21 lengths = x 6m = 126m

I would still seek the advice of a traffic engineer however.

http://www.nceng.com.au/

"A safe structure will be the one whose weakest link is never overloaded by the greatest force to which the structure is subjected” Petroski 1992

 

[pwht1]

Thanks Rowingengineer.

It's the reference to "percentages of capacity" that is confusing. If they just said 1st 100 cars then expect 3 vehicle lengths, 2nd 100 cars - 2 vehicle lengths etc it would make it a bit easier.

The traffic engineers are telling me, a traffic engineer in making, to ignore that section of code and aren't providing an alternative source of info.

 

[rowingengineer]

where in Australia are you? State by state is quite different on this issue.

http://www.nceng.com.au/

"A safe structure will be the one whose weakest link is never overloaded by the greatest force to which the structure is subjected” Petroski 1992

 

[pwht1]

The ACT, but apparently the governing body (Territoy and municipal services) have no say in the layout/design of privately owned carparks.