If you've ever dealt with a Design Standard Decision Document (DSDD), you already know they are not straightforward.

DSDDs are technical documents required by Caltrans when a fixed object falls within the Clear Recovery Zone. The standard exists for a reason: national data shows that approximately 20% of traffic fatalities involve vehicles leaving the roadway and striking fixed objects. As a result, DSDDs use collision data and location-specific analysis to document the engineering decision of whether a nonstandard fixed object will present a danger to the public.

DSDDs are complex, case-by-case, with no checklist. Most teams don’t realize how much time can be spent trying to figure out what each district expects. Approvals rely on engineering judgment, and that judgment shifts based on local conditions. Delays don’t just come from missing documents, but from mismatches between scope, plans, GIS data, and field conditions.

By the time a team works through district expectations, structures exhibits, and responds to repeated comments, the project timeline has already slipped. Lost time comes at a real price because delays can cost field crews up to $20,000 a day.

Project engineers cannot always redesign their work to avoid triggering a DSDD. The cost of working around one can be significant. Relocating existing assets triggered by a single pole move can push a project to relocate a mile or more of utility infrastructure.

DSDDs are not optional. Unauthorized use of Caltrans right-of-way can result in permit revocation, mandatory removal orders, and significant financial penalties. An unpermitted installation can surface years later during an audit, a project inspection, or an incident review. And if an accident occurs at a location where a DSDD was required and never obtained, your organization could be found liable.

Some vendors offer DSDD services without licensed engineers, stamped exhibits, or an engineer of record. Caltrans requires engineering documentation for a reason. An unstamped package can expose a project to additional scrutiny and set timelines back further.

EKN Engineering manages DSDD permitting as a structured workflow, resolving alignment issues across scope, exhibits, mapping, field conditions, and documentation before submittal, not after reviewer comments arrive.

EKN has extensive DSDD and Caltrans experience statewide, backed by measurable results:

  • 700+ permits approved in 2025
  • 94.8% approval rate across 404 DSDD applications
  • 92% reduction in permit revisions
  • 80% reduction in revision time

EKN has also reduced cycle times from 9 months to under 2 months across some jurisdictions, helping avoid months of rework, extended coordination, and unnecessary cost. Clients see the impact directly. As one Caltrans Transportation Engineer at a major IOU shared:

"EKN's applications are detailed, organized and thorough. The responsiveness to stakeholders and attention to detail made a real difference in keeping the project moving forward and minimizing revisions."

Contact EKN today to learn how we can help your team get through DSDD permitting with fewer revisions, faster cycle times, and approval the first time.