Table 4.2. Pavement Widening on Curves on Two-Lane Roadways

Degree Curve

Radius (ft.)

24-ft. Roadway

22-ft. Roadway

20-ft. Roadway

30 (mph)

40 (mph)

50 (mph)

60 (mph)

70 (mph)

30 (mph)

40 (mph)

50 (mph)

60 (mph)

70 (mph)

30 (mph)

40 (mph)

50 (mph)

60 (mph)

1.00

5,729.58

0.0

0.0

0.0

0.0

0.0

0.5

0.5

0.5

1.0

1.0

1.5

1.5

1.5

2.0

2.00

2,864.79

0.0

0.0

0.0

0.5

0.5

1.0

1.0

1.0

1.5

1.5

2.0

2.0

2.0

2.5

3.00

1,909.86

0.0

0.0

0.5

0.5

1.0

1.0

1.0

1.5

1.5

2.0

2.0

2.0

2.5

2.5

4.00

1,432.39

0.0

0.5

0.5

1.0

1.0

1.0

1.5

1.5

2.0

2.0

2.0

2.5

2.5

3.0

5.00

1,145.92

0.5

0.5

1.0

1.0

1.5

1.5

2.0

2.0

2.5

2.5

2.5

3.5

6.00

954.93

0.5

1.0

1.0

1.5

1.5

2.0

2.0

2.5

2.5

3.0

3.0

7.00

818.51

0.5

1.0

1.5

1.5

2.0

2.5

2.5

3.0

3.5

8.00

716.20

1.0

1.0

1.5

2.0

2.0

2.5

3.0

3.0

3.5

9.00

636.62

1.0

1.5

2.0

2.0

2.5

3.0

3.0

3.5

4.0

10.18

562.64

1.0

1.5

2.0

2.5

3.0

3.5

12.24

488.04

1.0

2.0

2.5

3.0

3.5

15.30

374.48

2.0

3.0

4.0

19.35

296.10

2.5

3.5

4.5

22.42

255.59

3.0

4.0

5.0

26.44

216.69

3.5

4.5

5.5

Notes:

1. Values for widening (ft.) for two-lane roadways - one-way or two-way traffic

2. Disregard values less than 2.0-ft. (above heavy line and not within highlighted area) for two-lane (one-way or two-way traffic) pavements

3. For three-lane and four-lane undivided roadways multiply values by 1.5 and 2.0, respectively and round to the nearest 0.5-ft. If values are less than 2.0-ft., disregard

4. Pavement widening is intended for utilization where truck traffic is significant and the increase in pavement width is to be 2.0-ft. or greater

5. Locations for pavement widening shall be shown in the construction plans or specified by the Engineer

6. Pavement widening to occur along the inside of the normal curve. Additional width is to be shared equally by all lanes.