Frequently Asked Questions
about Capital Improvement Projects
1. Why are some projects technically evaluated and others are not?
The vast majority of projects are technically evaluated.
Some projects such as an animal control facility, a fire station or a sheriff’s substation are so unique in purpose or service that the county only takes on such projects on a very intermittent basis. These projects literally have no competition. The public service derived from one of these types of projects is so unique and necessary that they are singular in nature for the purposes of a technical evaluation.
On the other hand, road projects which are planned and built on an ongoing basis, have numerous requests that must each be technically evaluated.
2. Why aren't all of the projects ranked against each other?
Projects are ranked among others of their type because they share a common public service. All roads provide mobility and safety so they are compared and ranked against one another. Drainage projects remove structures from the flood plain. There is no way to determine if the public service from a road is better than that derived from a flood control ditch. They provide different and distinct public good.
Comparing them to each other is akin to comparing 'apples' to 'oranges'.
3. Why is there both a numerical and alphabetical score for each project?
The numerical number is a measurement of the public service provided by a project and is used as the primary ranking tool.
The letter is indicative of other attributes directly related to the project and is only used as the tie breaker between projects.
4. Why is a lower ranked project funded over a higher ranked project?
Lower ranked projects might be selected because it is likely that they can be completed within the context of the two year bond cycle. While a higher ranked, longer term project might be put on hold until other funding sources become available.
Project readiness, or a project having completed design plans, is another factor that might determine if a lower ranked project is selected.
5. When can I submit a project request?
Project requests can be made at anytime. Generally, the closing date for submitting a project request for a bond cycle is mid-May of the bond year. For example, May 17, 2012 was the close date for this year's General Obiligation Bonds that are on the Nov. 6 ballot.
After the election, project requests will be accepted until mid-May of 2014, the year of the next bond cycle.
6. What if a desired project that was identified for funding doesn’t actually get implemented?
One example of this potential occurrence is the following: Capital improvement project types (e.g. Repaving Roads) that cover multiple facilities (e.g. individual streets maintained by Bernalillo County) are capped at the amount listed for the present 2012-2014 bond cycle. Users of this funding - the Public Works Roadway Operations & Maintenance Department - prioritize individual streets for repaving based on households served, # of work orders per road segment, remaining service life of road segment, existence of a school bus route on the road segment, and the functional classification of the road segment.
If repaving a specific road does not cost as much as estimated, then excess funds are rolled over to repave the next priority road. Conversely, if repaving a specific road costs more than estimated, then additional funds are drawn from the Repaving Roads bond item. This process is repeated until as many high priority roads as possible are repaved and all funds are exhausted.
The same situation applies to park and playground redevelopment at county recreational facilities whereby approved general obligation bond funding may not cover all needs.
7. Where did the network database come from?
Basic roadway features in the network database comes from the County Public Works Division, which maintains a GIS inventory of county roads. It is combined with road centerline features that are maintained by other sister agencies in the region, such as the City of Albuquerque and the Mid Region Council of Governments. The roadway network used here is a comprehensive coverage, including all local streets. In fact, this database also includes network information for other modes as well, including sidewalks, bike lanes, trails, etc. for analyses that involve non-motorized travel.
8. Is the network database a standard street centerline file?
Almost. A standard street centerline file can be used as a network database provided travel speeds have been assigned to roadway links through some mechanism. Also, the model actually requires the database to be compiled in a way that makes it easy for the application to used – however, TRAM provides a mechanism to do this automatically. As a practical matter, we place a lot of care in the preparation of the network database so it is maintained as an important database for the region.
9. How does the model distinguish directions of travel?
One of the things that TRAM does when converting a straight roadway centerline file to a TRAM network database is to represent directions of traffic flow explicitly. So a 2-way roadway is represented as two coincident opposing directional features, each with its own speeds (in the peak direction and in the off-peak direction). This means that the travel time contours generated by the model accurately capture travel in the peak and off-peak directions.
10. What speeds are coded on the database?
Posted speeds on major highways are available from the region’s travel demand modeling network. Congested speeds for major roadways (functional classes “collector” and above) typically come from the region’s travel time database that is created and maintained by the MPO. Average AM and PM peak hour speeds are available from travel time surveys. Speeds on other roadways, for example local streets, are typically estimated based on presumed speed limits (for example, 15 mph or 20 mph).
11. What source is used to estimate population and employment?
The model can use any zone-based source of information depicting the location of population and employment. Here, the socioeconomic database for traffic analysis zones created and maintained by the MPO is typically used. It contains information on current population, households, jobs, etc. This database is periodically updated to a new base year by the MPO. The current “base year” that is available in this region is 2010, coinciding with the census.
12. Can census block group information be used?
Yes, the model can use any source of demographic information that is associated with a zone system (GIS polygon features). The user can identify the source that should be used for an analysis.
13. How does the model estimate population within a contour when it bisects a traffic analysis zone?
The TRAM model automatically apportions values associated with a zone to the area within a contour by assuming that population in the zone is uniformly distributed throughout the zone. This is to say, it creates its estimate by prorating population on the basis of area.