-----------------------+-----------+-----+--------+----------+-------- Components | Ideal | | Plain | | Water- +---+---+---+ | Cement |Bituminous| bound |_V_|_W_|_X_|Brick|Concrete| Macadam |Macadam -----------------------+---+---+---+-----+--------+----------+-------- First cost, cheapness | 15| 15| 15| 8 | 10 | 10 | 15 Maintenance, cheapness | 25| 25| 20| 25 | 20 | 20 | 10 Durability | 7| 7| 7| 7 | 5 | 5 | 3 Ease of maintenance | 8| 10| 10| 7 | 8 | 8 | 10 Cleanliness | 5| 5| 5| 3 | 3 | 5 | 2 Low tractive resistance| 10| 5| 5| 5 | 4 | 4 | 4 Non-slipperiness | 10| 10| 10| 4 | 7 | 5 | 10 Sanitariness | 5| 5| 5| 4 | 4 | 5 | 3 Noiselessness | 5| 5| 5| 3 | 3 | 5 | 4 Acceptability | 5| 5| 8| 2 | 3 | 4 | 5 Favorableness to travel| 5| 8| 10| 3 | 5 | 6 | 8 +---+---+---+-----+--------+----------+-------- Total |100|100|100| 71 | 72 | 77 | 74 -----------------------+---+---+---+-----+--------+----------+-------- Anderson gives the following economical table to assist in arriving at a proper type of surfacing:[187] METHOD OF MAKING ECONOMICAL COMPARISON OF ROAD SURFACES -----------------------------------------+--------------------------- |Possible Types of Surfacing Item +--------+--------+--------- | _A_ | _B_ | _C_ -----------------------------------------+--------+--------+--------- Estimated life of surface with proper | | | maintenance, years | 4 | 8 | 12 Original construction cost per mile |$ 8,000 |$15,000 | $30,000 Annual charges for interest, depreciation| | | and resurfacing | 2,364 | 2,528 | 3,797 Cost of maintaining surface per mile, | | | average, annual | 1,000 | 750 | 200 Total cost per mile at end of 12th year, | | | period | 40,368 | 39,336 | 47,964 Value of road surface per mile at end of | | | 12th year period | .... | 7,500 | 12,000 Net outlay per mile of road | 40,368 | 32,836 | 35,964 -----------------------------------------+--------+--------+--------- The choice of selection here is evidently between _B_ and _C_, with the figures so close together that the one with the least number of uncertainties would probably be adopted if economy is the determining factor.