Highways and Highway TransportationChatburn, George R.
History
Highways and Highway Transportation
Chatburn, George R.
Roads; Transportation
_Bituminous macadam roads_ are ordinary macadam roads impenetrated
with bituminous materials. When well made they are excellent roadways,
and unless extremely heavy trucking comes upon them ought to prove
satisfactory for medium to moderately heavy traffic.
_Bituminous Concrete Roads_ are made of broken stone mixed with a
bituminous cement before laying and rolling. They, like bituminous
macadam, are smooth, non-slippery, easy riding, have small tractive
resistance and the first cost and cost of maintenance are moderate.
Such roads have proven very satisfactory where the traffic is dense but
not composed of real heavy units. On account of their dustlessness and
general sanitary character as well as for their durability they are
deservedly popular.
_Brick Roads._--Vitrified paving brick give a hard durable surface,
reasonably smooth and not slippery. The cost of maintenance is low and
the appearance is good. Brick roads are expensive as a heavy concrete
foundation is necessary, and they are noisy. They are well adapted for
heavy hauling.
_Concrete Roads._--This type of roadway is rapidly forging to
the front. With the exception of gravel it leads in mileage of
hard-surfaced roads. When made of good concrete sufficiently thick
it has proven itself to be durable, hard, smooth, of small tractive
resistance, comfortable, and not particularly expensive in first cost
or maintenance.
With horse-drawn iron-tired vehicles it is doubtful if it would prove
as durable as some other types but for rubber tired motorized vehicles
it seems to be extremely well adapted. There is no doubt but that this
type will continue to be popular. It has a tendency to crack under
the action of temperature and moisture. It is customary to fill these
cracks with tar, pitch or asphalt, giving an appearance which some
people think not pleasing. The pavement is rigid and noisy, therefore
objectionable for some localities.
_Creosoted Wood Block Roads._--Wood blocks treated with creosote to
preserve them from decay make an excellent pavement. They are smooth,
durable, noiseless and sanitary, have small tractive resistance and
are comfortable to ride upon. The principal objection is their habit
of “bleeding” in the summer time. The sticky oil tar that oozes out
is very objectionable, as it adheres to shoes and is tracked into
houses. The first cost is considerable, but maintenance is low for many
years after laying. Wood block roadways seem well adapted for bridge
floors, for stable and shop floors, and for heavy teaming when placed
on a substantial concrete foundation. They seem to last better for a
moderate or semi-heavy use; when left idle they are more subject to
decay.
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