CIVE 1180 TRANSPORT ENGINEERING 1

发布时间：2025-10-13

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5. Horizontal Alignment:

As per the Austroads Functional Classification our designed road is classified as Class 2 Rural (A Route Classification). The average speed of vehicles passing through the new roads is assumed to be like an two lane- two way Intermediate Speed Rural Road where the Minimum operating speeds on these roads are generally 70–90 km/h. [3.4.2. Austroads Guide to Road Design: Part 3]. However, drivers will accelerate their vehicle if they get the opportunity and the speed may certainly increase up to the desired speed where possible, let’s say 100 km/h.[3.4.2. Austroads Guide to Road Design: Part 3].

Table: 7.8 [Austroad Guide to Road Design: Part 3]

From the above table, as our road is in the criteria of intermediate speed rural, maximum superelevation 7%.

Figure: 7.5 [Austroad Guide to Road Design: Part 3]

Assuming Max Operating Speed to be 100 (km/h), the friction factor coefficient comes 0.16

Calculating Minimum Radius of Curvature:

We know,

Where,

Design Speed, V = 100 km/h

Maximum Elevation, e_max = 7% = 0.07

Friction Factor, f_max = 0.16

We get,

Superelevation,

From the Excel file we get that for all the curves on the road the calculated superelevation (e) value is negative(-ve). Which means that the curves have enough big radius that there is no need to add superelevation during the design process.

From Part-A, we have that the maximum grade is 5%. Thus, the maximum grade is still granted in all sections. No need to change our optimized route design.

Points	Distance	Elevation	Radii	Angle	Operating Speed (km/h)	Progressing distance	Vertical point	Grade	Vertical Point x10
A	0	225			100	0	0,225	0.00	0,2250
1a	1292.52	233.75			100	1292.52	1292.52,233.75	0.68	1292.52,2337.5
1b	283.81	221.67	550	27.6	100	1576.33	1576.33,221.67	-4.26	1576.33,2216.7
2a	639.83	234.17			100	2216.16	2216.16,234.17	1.95	2216.16,2341.7
2b	411.82	226	600	39.34	100	2627.98	2627.98,226	-1.98	2627.98,2260
3a	1505.68	230			100	4133.66	4133.66,230	0.27	4133.66,2300
3b	463.96	230.3	800	33.23	100	4597.62	4597.62,230.3	0.06	4597.62,2303
4a	847.64	235			100	5445.26	5445.26,235	0.55	5445.26,2350
4b	362.34	239.4	1000	20.76	100	5807.6	5807.6,239.4	1.21	5807.6,2394
5a	1001.3	243.57			100	6808.9	6808.9,243.57	0.42	6808.9,2435.7
5b	311.25	245	1000	17.83	100	7120.15	7120.15,245	0.46	7120.15,2450
6a	1051.38	250			100	8171.53	8171.53,250	0.48	8171.53,2500
6b	338.09	254.37	800	24.21	100	8509.62	8509.62,254.37	1.29	8509.62,2543.7
7a	748.14	273.57			100	9257.76	9257.76,273.57	2.57	9257.76,2735.7
7b	81.07	277.5	800	5.69	100	9338.83	9338.83,277.5	4.85	9338.83,2775
8a	866.49	267.5			100	10205.32	10205.32,267.5	-1.15	10205.32,2675
8b	179.81	271.67	600	17.17	100	10385.13	10385.13,271.67	2.32	10385.13,2716.7
B	409.42	275			100	10794.55	10794.55,275	0.81	10794.55,2750
	10794.55

Road Width:

Lets Consider, Annual Average Daily Traffic is ranged from 500-1000.

Traffic Lane = 3.5 x 2 = 7 m

Total Shoulder = 1.5 m each side x 2 = 3.0 m

Total Width of the Road = 7+3 m = 10 m