APPENDIX 2. Classification of the distance out from road center line that different types of road projects are projected to impact.
The values presented here are the distance from road center line that
different types of road construction projects will impact for California State
highways. The distances were developed by Caltrans biologists and planners. A
project footprint as described in the text would use this distance to buffer
each side of the road, for the length of the project. This footprint can then be
used to sample biological resource layers such as land cover maps, species
locality maps, etc.
|
|
| Project
Type |
Footprint Width (Meters) |
|
| New
alignment |
152.4 |
| Reconstruct
interchange and access ramps |
61.0 |
| Construct
expressway |
61.0 |
| Construct
new bridge |
45.7 |
| Widen
roadway |
30.5 |
| Remove
rail trestle |
30.5 |
| Realign
curve |
30.5 |
| Grade
separation improvements |
30.5 |
| Construct
expressway existing alignment |
30.5 |
| Slow
vehicles lane |
15.2 |
| Passing
lanes |
15.2 |
| Construct
lane |
15.2 |
| High
occupancy lanes |
12.2 |
| Stabilize
slope |
9.1 |
| Rehabilitate
roadway |
9.1 |
| Construct
noise barrier |
9.1 |
| Construct
left turn lane |
9.1 |
| Construct
retaining wall |
6.1 |
| Install
median barrier |
6.1 |
| Roadside
rest areas |
3.0 |
| Install
warning devices |
1.5 |
| Install
message signs/traffic operation systems |
1.5 |
| Install
ramp metering |
1.5 |
|
|