The County has been doing TDM in land development for years, but in more recent years reducing trips has become a more prominent issue, and is noted numerous times in the most recent Comprehensive Plan. To increase the use of TDM in land development, the County conducted a TDM methodology study and collaborated with developers, consultants, and other agencies to come up with a program based on standards. TDM in the County is tied to a developer’s proffers. Tying TDM to proffers ensures that they run with the land, so if the site changes hands, the TDM that we worked to come to an agreement to is still in tact.
Certain documents are compiled by the developer. This includes a set of proffers that is mutually agreed upon and accepted by the board.
The TDM Plan is prepared generally alongside the proffers, and it provides a menu of options for the developer to choose while implementing their TDM program. TDM Plans are generally only needed for sites in Tysons and close to Metro stations (if they are outside of Tysons).
A TDM Work Plan is provided no later than 180 days after issuance of the 1st building permit. This is a blueprint for the TDM program and includes more detailed information including which strategies they are going to implement and when.
The Annual Report is submitted to me each year to monitor progress. I will elaborate on this in an upcoming slide.
We use ITE rates to estimate the trip generation for the potential development, then choose an appropriate reduction from that number based on our TDM Guidelines. The reduction is a percentage of the predicted ITE trips that they have to decrease their actual trips by. We use ITE in order to be consistent with other County processes, such as traffic analyses.
Our reductions are first based on whether or not the site is in Tysons. An important thing to note is that Tysons and Non-Tysons have some differing TDM standards, as this is a very different landscape than the rest of the County. If it is in Tysons, then the reduction depends on the overall span of development in Tysons as well as the site’s proximity to a Metro station.
For sites outside of Tysons, their goal is dependent on if it will be office or residential, and proximity to Metro.
-Developers conduct trip counts that are typically annual to determine the actual number of trips during peak travel hours.
-Surveys on mode-split are done every three years, and these help determine travel attitudes and behaviors, and can include questions that can help the developer better serve those using the site.
-The Applicant Control Period ends after 3 consecutive counts show that the site is meeting its goal.
Annual reports are provided within the first quarter of the calendar year to me. I review and approve their compliance with the proffer that indicates the submission of the Annual Report. Sample from Annual Report for a successful Tysons program. In addition to counts and survey results, these reports indicate how the budget was spent, changes to the budget or TDM program and plans for the next year.
- The tables in the slide show the amount of Remedy and/or Penalty Funds that need to be spent if goals are not reached. This is done by looking at how far they were from their goal. - Before having the developer dip into Remedy Funds, we have a meeting with them to discuss how they can improve their program, and they have another year to make their goal before using their Remedy Funds. - No one has yet had to use either of these funds, which is an indicator of a successful system.
Fairfax County TDM in Land Development: April 19, 2016
Fairfax County TDM in
Bree Clohessy, Transportation Planner II & Site Analysis TDM Coordinator
Comprehensive Plan goals for reduced trips
TDM methodology study
Collaboration with developers, consultants, other
Proffers tie TDM to the land
TDM Work Plan
Tysons Corner Trip Reduction Goals
Square Feet of
GSA in Tysons
Distance from Metro Station
0 to 1/8
Trip Reduction Goal
Up to 65,000,000 45% 35% 30% 25%
65,000,000 50% 40% 35% 30%
84,000,000 55% 45% 40% 35%
90,000,000 58% 48% 43% 38%
96,000,000 60% 50% 45% 40%
105,000,000 63% 53% 48% 43%
113,000,000+ 65% 55% 50% 45%
Development Non-Tysons TOD Locations Non-TOD
than ½ mile
1 to 1/4 mile
1/4 to 1/2 mile
Office Baseline* 30% 25% 20%
TDM Goal 45% - 35% 40% - 30% 35% - 25%
Residential Baseline 30% 25% 15% - 10%
TDM Goal 45% - 35% 40% - 30% 25% - 15%
Counts: Annual or biennial
Surveys: Every 3 years
TDM Requirements by Location
TDM Components Tysons Non-Tysons
½ mile of
1-1/2 mile of
All other TDM
Trip Counts Annually Annually until 3 consecutive
counts show goal has been
met, then biennially
Surveys Every 3 years, unless otherwise approved
End of Applicant
Post build-out, after 3 consecutive counts show goal has
• Annual recurring cost set by developer for TDM expenditures
• One-time contribution intended to incentivize participants
• Funds are put aside for expenditures if TDM goals are not being met. Used to
increase efforts to meet goals. Included in all developments in Tysons and others
within 1 mile of Metro.
• Financial contribution to the County to be used if trip reduction goals are not met
after Remedy Funds are exhausted. Tysons only.
• Participate or contribute to TMA if applicable.
Counts and/or survey results
How budget was spent
Changes to TDM Plan
Details on the TDM activities done
Plans and budget for next year
Remedy Funds: Tysons and Non-Tysons Within 1 Mile of Metro
Penalty Fund: Tysons only
Tysons Remedy Fund: Payment Schedule
Failure to Meet Trip Goals Remedy Expenditure
1% - 3% 1% of Remedy Fund
3.1% - 6% 2% of Remedy Fund
6.1% - 10% 4% of Remedy Fund
Over 10% 8% of Remedy Fund
Non-Tysons Remedy Fund: Payment Schedule
Failure to Meet Trip Goals Remedy Expenditure
1% - 3% 3% of Remedy Fund
3.1% - 6% 6% of Remedy Fund
6.1% - 10% 10% of Remedy Fund
Over 10% 15% of Remedy Fund
Penalty Fund: Payment Schedule
Failure to Meet Trip Goals Penalty Owed
1% - 3% 5% of Remedy Fund
3.1% - 6% 10% of Remedy Fund
6.1% - 10% 15% of Remedy Fund
Over 10% 20% of Remedy Fund