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HONG KONG DAILY PRESS, MÔNDAY, MAY 7, 1934.

HONG KONG'S MOTOR ROADS

The New Traffic Difficulties

On Friday last, an interesting lecture on the subject op Road Construction was given by Mr. A. E. Lissaman, F.SI., to the men- bers of the University Engineering Society in the University. While dealing in a general manner with the engineering features of road construction, Mr. Lissaman mentioned various interesting matters concerning the roads of Hong Kong. Mr. T. S. Lim, chairman of the Society, presided.

In

If

Local Conditions

There are one or two other types of surfacing I could men- tion: Introducing the use of rub- ber, iron, cotton fabric and wool, but these are not exactly in com- mon every day use so I will skip them.

which is flooded for best part of the year, and is therefore dificult to keep water out of road founda- tion.

Old surface broken up. and rolled in new concrete baunches, of margins, to support new sur- face.

allgnment.

Surface

„Apart from the general recon- struction of road "lines, a good deal of attention has been given to surfaces, and whilst on about surfaces, it is perhaps as well to remind you that in road construc- tion one is not always able to confine"

New surface water - bound macadam 4′′-6” thick_tar-painted and Anished with granite chips or a local gravel.

the enormous shock

Super-elevation on bends, cut- speaker, withstand introducing the Professor Middleton Smith," Pre- and abrasion to which carriage- ting back corners and general re- sident of the Society, said that

ways are subjected." they were very grateful to those good local engineers who were enough to come to the University to give them the benefit of their practical experience. Mr. Lissa- man has been concerned with the practical work in road construc- tion in Hong Kong and anyone who had witnessed the very great | Improvement that has been made

Before giving and flustrations In recent years in our local roads,

of actual local improvements, Ingineering side of the question. und who knew the peculiar

should like to make a few general but is often obliged to turn man- ufacturer as well This applies in difficulties arising

out of the

can safely

Hong Kong, we have in the colony modern traffic conditions would remarks: think it

be said that any real advances in appreciate the work done by the

accessories for the road are man- local Public Works Department, local motor transport have taken quarry where all material and

12 Of 14 place within the last

ufactured, including all grades of In China many thousands of miles

this, the only

crushed, stone. tarred macadam, of roads were being constructed years. Prior to

wheeled traffic worth considering tu-day. In the provinces of

(with the exception of a few cars) Kwangtung and Kwangsi many thousands of miles of roads had amounted to rickshas and hand trucks, and the latter although heavy, were very slow moving and did little damage except on upper surface.

teen built during the last ve years and engineering graduates of the University of Hong Kong had taken a very prominent part in that work He felt aure that.

many of the undergraduates pre- sent would also be engaged on similar work in future and would learn a great deal from the ex- periences or Mr. Lissaman and his engineering colleagues the Public Works Department, Hong Kong... The following is a brief abstract of the lecture which was illustrated with many original diagrams.

1n

"Addressing the gathering, Mr. Lissaman said:-

"I hope during the course of this talk, to shew that even a simple looking thoroughfare of to-day has needed much thought and ex- pertence, and many experiments to bring it to its present state of perfection a state demanded by present day mechanical transport It has been said that "The pro- sperity of any place can be judged by the condition of its roads" When one considers the tremen- dous costs involved in the cons- truction and upkeep of the excel- lent thoroughfares now in exis tence in most parts of the world and bearing in mind the fact that industry in general foots the bill. no doubt remains as to the truth of this statement.

Our roads unfortunately have not always been in this state of perfection, but like other En- gineering works, have had to be developed slowly.

the

Recent years have. however, brought a great change in traffic throughout

Colony Motor

-the

buses, lorries and cars are now numerous

one's labours to the

asphaltic carpets. paving slabs" for footways and such things as

street and traffic nameplates and sigas. In this respect, we are not quite so fortunate as some of our brother Engineers who, by simply writing, can obtain such articles from Contractors. who specialise in nothing else.

- Conclusion

and are subjecting And now, as a few final words, many of our roads to something. I am going to forestall you by saying that I quite realise what a entirely different from what was anticipated when they were first lot you still want to know but as The gradients, explained in the beginning-such constructed.

A subject as this can only be widths, and alignment in many

treated in a very general way in cases bear out this fact, and we

time. However, 1 are now faced with the task of so short a

there is any particular point on improving and strengthening" to the best advantage some miles of which you need a little more en- thoroughfare in order that the lightenment. I shall be pleased to requirements of modern transport help you if I can." may be met.

do

Conditions here not lend themselves to the construction of roads of a type to be seen in roll- ing country, 30 that whatever ideals we may have, we are bound to give way when encountering some of the precipitous slopes "of the local hills. Yet in spite of this. demands for better wider and stronger thoroughfares are steadily being met by regarding. widening, re-shaping and re-sur- facing lots of roads hitherto un- suitable for modern traffic.

Some Improvements

I have some photographs and sketches of one or two typical ex amples of local road Improve-

ments:

(1) Garden Road to May, Road. Leads from top of Garden to May Road Tram Station and be- and consists chiefly of yönd, widening a previous footpath.

"Road is 20 ft. wide supported on retaining walls one side, and in cutting other.

}

Modern Roads The construction of "Modern Roads" can be divided into 5 main heads: (1) The formation of new. roads, (2) The Improvement of existing, roads. (3) The lay-out and improvement of intersections, It is approx. 5,000 ft. in length, (4) The provision of suitable sur- 3,800 of which rise 270 ft. Gives face, and (5) General lay-out and average grade of 1 in 13.33 about. lighting.

Ruling grade is 1. in 10, eased to

We will first consider the form- 1 in 15 on benda Burfacing 4in. atlon of new roads.

Tarmac, tartops, tarpainted and The most important item here chipped with 3/8in. granite chips.

Hairpin is that they must, to be of full

bend-outside radius benefit, be constructed to take the 35in. grade 1 in 15. traffic-end not the traffic adapted (2) Robinson Road

From Peak Road to the road. At the same time one should not forget that extra Nullah. Chiefly widening

Now constructed. margin, which may eventually be road. required for widening purposes general width of 26 ft. with 2'-0" due to future development.

extra widening on bends. A 6.-

ہیں

to

Gleneally

old

to

E'

In attempting to achieve ouro it. "Tootway provided leaving 20". object it is necessary to combine and 22 ft. carriageway, The car- 3 features-width, gradient and cariageway has a crossfall of 1-in alignment.

30, with 10" of super-elevation" on The carrying of a road it not bends. Footway is paved with however, solely influenced by 24" granolithic paving-fall to 1. width alone, but must be con- | it. Carriageway Tarmac. sidered in relation to alignment thick and tar topa. Granite kerbs and gradient. In flat country the 12" x 6" and granite set chan- latter two factors may not be nels.

4"

quite so important, but in hilly (3) Magazine Gap Road widen- country such as obtains locallying for motor traffic.

The Layout

ד.

for instance, where the hills are Takes of at May Road and Magazine Gap high and steep, interspersed fre leads up to

widening a footway. quently with large ravines, thechiefly. alignment and

over-all width gradient claim Road. has at

to 27 It. ft. widened first attention as it is upon these of 25 that speed and consequent bulk on bends-and will have a 5 ft. of traffic depend.

footway Road is approx. 3,300 ft. long, rises 380 ft. Le an average grade of approx. 1 in 8.70. The Quite a problem is presented in max. and min. grades will be 1 in this respect in coping with pre-1.37 and 1 in 115 respectively. sent day traffic requirements, and Minimum radius of inside curve in the larger cities of the world 58'-0" Super-elevation on bends. Concrete kerbs such problems are of no small Surface tarmac,

12" x 8" and concrete channels. magnitude.

This question of the provision Concrete used as plenty of stone of the subject, particularly on fob

engaged more of the Engineer's (4) New Territories. attention, than any other branch

of the subject, particularly within recent years, when due to

Lots of you must have eceri what is going on in the New Ter- ritories in the way of strengthen-

the ever increasing loads carried, Ing the existing surface of the and speeds attained by motor main" road: transport, it is found necessary to

Many miles

throughpaddi-

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